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Journal of soil science and plant nutrition

versión On-line ISSN 0718-9516

J. Soil Sci. Plant Nutr. v.11 n.1 Temuco  2011

http://dx.doi.org/10.4067/S0718-95162011000100010 

J. Soil Sci. Plant Nutr. 11 (1): 127-140 (2011)

 

SOIL FERTILITY EVALUATION OF COFFEE (Coffea spp.) PRODUCTION SYSTEMS AND MANAGEMENT RECOMMENDATIONS FOR THE BARAHONA PROVINCE, DOMINICAN REPUBLIC

 

P.A. Núñez1*, A. Pimentel1,I. Almonte1, D. Sotomayor-Ramírez2, N. Martínez3, A. Pérez1, and CM. Céspedes1

1Investigadores Institute Dominicano de Investigaciones Agropecuarias y Forestales (IDIAF), Avenida Imbert # 5, Las Carolinas, La Vega, República Dominicana. *Corresponding author: pnunez@idiaf.gov.do

2Catedrático del Departamento de Ciencias Agroambientales, Colegio de Ciencias Agrícolas, Universidad de Puerto Rico, Recinto Mayagüez, Puerto Rico.

3Magister en Ecologia y Medio Ambiente, Universidad Pedro Henriquez Urefia, Santo Domingo, República Dominicana.


ABSTRACT

Reported yields in most coffee farms of the Barahona province in the Dominican Republic are relatively low (< 290 kg ha-1 parchment coffee). In general, coffee producers do not use diagnostic techniques such as soil testing. This fact prevents them from identifying the limiting factors (especially nutrients), complicates the work of coffee cultural management practices, and potentially reduces productivity and coffee quality. This study was designed to diagnose the fertility level of soils in coffee farms in the area of Barahona in 96 farms within an area of 637 hectares and design a nutrient management strategy. Soils from each farm were sampled and analyzed for soil fertility parameters. A survey was provided to farmers that permitted the collection of information regarding yields, management practices, and landscape features. Soils in the area were predominantly clayey. Soil pH varied between 4.61 and 7.69 and soil organic matter ranged between 3.29 and 10.9%. Exchangeable potassium levels were classified as deficient in all areas. The clustering of results identified two main components, which accounted for 76% of the variability of the data and the grouping into five communities by similarity of features. The results show that soil testing of this coffee coffee-growing region can be used as a tool to diagnose the soil fertility status and guide them in implementing management and fertilization recommendations.

Keywords: soil fertility, yield coffee, fertility diagnostic, Dominican Republic.


INTRODUCTION

The production of coffee (Coffea spp.) has of great economic and social importance at local, regional and global levels. In the Dominican Republic, coffee is second most important agricultural product for export, after cocoa. Bean exports from Dominican Republic have stabilized in the last 4 years (2006-2009) with an average of 122,000 quintals (1 quintal = 45.5 kg) of market coffee per year, after averaging only 61,000 quintals in the years 2004 and 2005. Said amount represents an increase of about 100% in the volume of these exports. For this same period, the annual value of bean exports has increased from US$ 6.8 to US$ 17 million, which represents an increase of 150% in export value (CODOCAFE, 2010). In the 2009, national coffee production recorded an increase of 6.65%o compared to 2008, while the export value of 137,580 quintals of green coffee increased by 32.71 % over that in 2009, for a value of US$ 20.9 million. The estimated production of parchment coffee is between 600,000 and 700,000 quintals (27,273 to 31,818 metric tons). The Dominican Republic has a coffee production area of 132,500 ha occupied by 50,000 farmers (CODOCAFE, 2002).

A sustainable system of coffee production should prevent soil erosion and contribute to the preservation of forests and their associated habitat (Martínez, 2010). This system should also produce environmental benefits, such as conservation of flora and fauna (provides protection and shelter for native and migratory species of birds), increase the scenic value of the field, and improve air quality (Hergoualc'h et al, 2008). Coffee is a crop that is produced under a variety of growing conditions, and is widely cultivated in tropical climates (CENICAFE, 1999) with similar conditions to those in the Dominican Republic (Vicente-Chandler et al, 1968). The coffee production zone in the Dominican Republic has average annual temperatures between 17 and 30 °C, rainfall ranging between 1000 and 2400 mm and altitudes between 200 and 1400 m.a.s.l. Although there are ecologically suitable for coffee production, the yields reported in the majority of farms are relatively low (< 290 kg parchment coffee ha-1). Soil is one of the most important factors related to the productivity of coffee (Almonte, 2008). Avelino et al (2002) reported that the acidity and soil texture influence the quality of the grain coffee. Escarraman et al (2008) reported that the planting altitude and variety are the factors that have the greatest influence on the granulometry and sensory characteristics of coffee.

In the Barahona Province of the Dominican Republic, coffee is planted mainly under shade conditions. According (Almonte, 2008), most coffee soil from Barahona province belong to the order Inceptisols and Entisols. The soils vary from moderate to strongly acidic. However, this information is not conclusive and varies according to the management. Farmers in the area generally lack specific knowledge about the properties associated with the fertility of farm soils. The lack of quantitative knowledge related to crop limiting factors, prevents farmers from taking proper corrective actions; hinders cultural cropping practices, and reduces coffee yield and quality. Proper diagnosis and sustainable fertilizer recommendations cannot be made without recent information on the fertility characteristics of soils. This research was conducted with the goal of diagnosing the nutrient status and other soil fertility limiting factors, and to refine management options for these agroforestry systems in the Barahona Province.

 

MATERIALS AND METHODS

Experimental site and description area

The Barahona Province has an extension of 1,639 km2. It is located between latitudes 18°40' and 18°12'N and longitudes 71° 17' and 71°21' W, southwest of the Dominican Republic. The area has an altitude between 700 and 1200 m.a.s.l, has a temperature annual range of 17 and 22 °C with an annual average of 26 °C1 The annual rainfall varies between 655 and 2296 mm (Pérez et al, 2002). The coffee cultivated area in the Barahona Province is 11,082 ha with about 3,565 participating farmers (CODOCAFE, 2002). Most of the area (98.6% or 30,710 ha) is in arabica cofee (C. arabica), whith the remainder (1790 ha) is planted to robusta coffee (C. canephora).

Farm survey and soil sampling

The fifteen coffee production areas of the Provice were identified from which 96 farms were selected. The farms were identified based on the 2001 National Coffee Census (CODOCAFE, 2001). The sample size was computed using the software InfoStat (2008), with an error of 10%, considering the total number of coffee farms (3,565 farms), in an area of 11,082 ha. Specific location of each farm was made using using topographic sheets for the area. All farm visits were made from April to July 2009.

The distribution of cases by location was based on proportion of farms and area occupied by location: Las Guazaras (7), Santa Helena (9), Bahoruco (6), Las Cienaga (12), Polo (3), Breton (10), Monteada Nueva (1), La Lanza (7), Los Charquitos (8), Platon (1), Leonardo (7), Los Patos (7), Maria Teresa (5), Chene (7) and El Pino (6). Each farm was georeferenced with GPS model Garmin GPS 76 (Garmin International Inc., Olathe, KS). A survey was prepared and personally supplied to each farmer in order to characterize current yields, agronomic practices and other related information, for example: weed control, pest management practices, soil conservation practices, extent of shade-tree pruning, coffee tree pruning and fertilization or manure management practices.

Soils were sampled to a depth of 30 cm with bore or cutting blade. A composite sample from each farm was gatherd by taking six subsamples from each of the three main geomorphologic positions (shulder, backslope, foot-toe slope) at the farm. Two subsamples were gathered from each geomorphologic position). All leaves and other surface debris were removed by hand. The six sub-samples were homogenized to obtain a composite sample of 2 kg. Samples were placed in previously identified plastic bags and sent to the laboratory for analisis within two weeks.

Soil characteristics

Soil samples were air-dried and sieved to pass a 2-mm mesh sieve. Soils were analyzed for soil fertility characteristics following methodology outlined in Page et al. (1982).

The pH was determined in a ratio 1:2 (soil: water) using a potentiometer. The organic matter (OM) was measured by the Walkey and Black method (potassium dichromate oxidation). The electrical conductivity was determined on the supernatant obtained from a 1:2 (soil: water) suspension using a conductivity bridge. The total nitrogen (TN) was measured using the Kjeldahl method. Available P was extracted using the Mehlich III extractant followed by quantification in a UV-Vis spectrophotometer. The exchangeable bases were measured by the extraction with NH4OAC followed by quantification using atomic absorption. Exchangeable acidity was extracted with 1M KC1, followed by the quantification of Al and H by titration. The micronutrients iron (Fe), copper (Cu), manganese (Mn) and zinc (Zn) were determined by the method of digestion with nitric-perchloric acid by followed by quantification by atomic absorption.

We calculated the effective cation exchange capacity (ECEC) based on the sum of the bases and exchangeable acidity. Aditional relations such as Ca/Mg, Mg/K, Ca+Mg/K, sodium saturation percentage (SSP) and aluminum saturation percentage (ASP) were calculated. The texture was measured in the laboratory using a hydrometer Bouyucos (Page et al, 1982).

All tests were performed according to the standard protocols of the CENTA-IDIAF Soil Test Laboratory. Each sample was tested the color (wet) with the Munsell color chart.

Statistical analysis

The data were analyzed using descriptive statistics, using the InfoStat software (version 2008). Multivariate analysis was applied to the data: principal component analysis (PCA) and cluster analysis, with clustering by Euclidean distance.

 

RESULTS AND DISCUSSION

Overview of the coffee farms

Most coffee production farms in the Barahona province are small, as 64% had an area less than 5 ha and 56%> of were between 2.1 and 5.0 ha. The median farm area was 3.75 ha. The largest farms were found in Chene and Las Cienagas locations with a mean area of 56 ha and the smallest were found in Polo and Los Charquitos with a mean of 0.94 ha (Table 1). This information coincides with that reported by Nunez and Cuevas (2004) in coffee plantations in the provinces of Monsenor Nouel and La Vega. As thefarms were small, the farmers may lack the resources to hire and/or perform diagnostic techniques for soil nutrient status and plant.

The coffee farms evaluated were in an altitude range of 309 to 1279 m.a.s.l. Most farms (64%) were within ranges considered optimal for coffee production, which is between 700 and 1,000 m.a.s.l (Almonte, 2008; Almonte et al, 2010). About 17%> of the farms were located at altitudes above 1,000 m.a.s.l. and the remaining 19% were at or below 700 m.a.s.l. The average soil slope range was between 0.5 and 20%. However, on occasion, some slopes of over 50% or more were identified, and predominated in Guindadero and El Membrillo in Bahoruco locations.

Most of the farms were planted to Caturra and Typica variety. The highest percentage (69%) of farms had Typica coffee and a smaller percentage (31%) had Caturra. The highest coffee parchment yields were reported in Los Patos (501 kg ha-1), Monteada Nueva (464 kg ha-1) and Maria Teresa (315 kg ha-1). These yields are slightly higher than those reported nationally for parchment coffee of 290 kg ha-1. The reported yields in the remaining locations were lower than the national average (< 200 kg ha-1 parchment coffee). A possible reason for the low yields is that farmers do not fertilize adequately, there is no structured agronomic management program (including pest management, pruning, replanting), lack of manpower, and reduction in international prices coffee, all of which discourage the farmers to use available technology (Table 1).

Coffee plantation management and soil description

The coffee farmers that were surveyed did not use chemical fertilizers. About 16% of farms carried out some type of practice associated with the use of organic amendments in solid or liquid form in the form of plant residues or animal manures.Therefore, the vast majority of farmers depend on the capacity of the soil and recycling of plant materials to supply nutrients to the crop. About 78% of farms do not use any soil conservation practice.

All farms had some type of shade in the form of fruit trees or evergreen secondary forest. The shading extent was not quantified. The majority of farmers (92%) carry out some form shading management. In all farms, inga (Inga vera), was the dominant shade species and to a lesser extent poppy (Erythina poeppigiana), cedar (Cedrela odorata),avocado (Persea americana), several species of citrus (Citrus spp.), royal palm (Roystonea hispaniolana, and fig tree (Ricinus communis). Most coffee plantations are inter-cropped with banana (Musa AAA), and is used to supplement farmer's income when coffee is not being harvested. Other minor inter-cropped crops were yam (Xantosoma spp.), squash (Sechium edule), cassava (Manihot esculenta) and plantain (Mum AAB).

All farmers control weeds manually or with selective herbicide. All farmers control the coffee borer (Hypothenemus hampei) using recommendations made by the Dominican Coffee Council (CODOCAFE), which are a combination of cultural practices and the use of traps. The other pests or diseases of the coffee are not considered economically important, and are not managed.

Soil texture varied among farms. About 52% of soils were predominantly clayey, 21% were silt-loam, 16% were clay-loam, 10.4% were loamy, and 1% of the farms were sandy-loam (Table 2). The representative colors of the soils in the Barahona province are: red (2.5YR4/6, 2.5YR4/8, 7.5R4/6), yellowish brown (10YR5/6), yellowish red (5YR4/6, 5YR5/6), brown (7.5YR4/2, 7.5YR4/3, 7.5YR4/4), reddish brown (2.5YR4/4), dark brown (10YR3/3, 7.5YR5/6, 10YR3/3), dark yellowish brown (10YR4/4), dark reddish brown (2.5YR3/3), brownish yellow (10YR6/6), pale yellow (2.5Y8/3), strong brown (7.5YR5/6) and reddish yellow (7.5YR6/6). These colors vary with the locations and the soil depth (data not shown).

Soil reaction was acid in six locations (Monteada Nueva, La Cienega, Los Patos, Platon, La Lanza and Bahoruco), but there was a wide range of soil reaction that ranged from with mean soil pH of 6.14 (Table 3). The electrical conductivity (EC) ranged from 0.13 to 0.92 dS m-1. Soil organic matter ranged between 3.0 and 10.8% with an average of 7.4%. The mean total N in all soils was 0.53%o. The mean available P was 14.3 mg kg-1 and exchangeable potassium (K) was 0.27 cmol(+) kg-1 in the range of 0.12 to 0.45 cmol(+)kg-1). The mean content of extractable iron (Fe), zinc (Zn), magnesium (Mg) and copper (Cu) were 215, 4.67, 46.6, 5.99 mg kg-1, respectively. Soil exchangeable calcium (Ca) varied between 2.26 and 43.4 4 cmol(+) kg-1, and exchangeable Mg content ranged from 0.55 to 3.56 cmol(+) kg-1. The effective cation exchange capacity (ECEC) ranged from 4.67 to 46.3 cmol(+) kg-1 and ratios of Ca/Mg were between 4 and 20, very similar to the Mg/K ratios in the range of 6 to 17). The Ca+Mg/K ratios were high (27 to 194). Na and Al saturation indices were in range from 0.6 to 6.65 % and 0.38 to 20 %, respectively. We expect that these Na and Al saturation indices are not limiting coffee production in the farms.

Soil fertility diagnosis of coffee farms

The first two principal components account for 76% of the total variance (Table 4). The first component has the higher explanatory power of the data. In this component, positive values for soil pH, EC, exchangeable bases, ECEC, Ca/Mg, Mg/K, OM and total N (group 1) are observed more or less in similar proportions; other variables such as Na saturation percentage, Al saturation percentage, Fe, Mn, Zn and P are grouped in opposing areas of the former group. There is a high correlation between the components and variables, which assures the representativeness of the variables. The magnitude of the values is associated with desirable and un-desirable soil characteristics. As these properties are linked to the concept of nutrient availability, high values in the variables of the first group are linked to adequate soil fertility. The second component explains 14.0% of the total variability. If this component is associated with the first, it may indicate that the soils have adequate acidity, Na saturation percentage, Al saturation percentage and Cu and a few have problems of acidity or salinity (Table 4).

The analysis discriminates two different site-categories as opposite positions (Figure 1). On the left figure shows, related to CP1, sites with content items associated with soil salinity and acidity levels, including Monteada Nueva, La Lanza, Bahoruco, La Cienega, Los Patos and Platon. Items associated with fertility rates differ on the right vertical axis given by CP1, which relate to locations such as Breton, Los Charquitos, Maria Teresa, El Pino, Santa Elena, Chene and Las Guazaras. In the upper quadrants, with respect to CP2, there are areas with the highest correlation elements to this component and lower quadrants elements with negative relationship.

In the cluster analysis, the locations El Pino, Chene, Maria Teresa, Los Leonardos, Breton, Santa Elena and Las Guazaras are grouped together (Figure 2). This differentiation is shown with a dotted vertical line drawn from a value representing 50%o of the maximum average euclidean distance (DEPmax), according with Indeangelo et al (2007). The locations Las Lanzas, Polo and Los Charquitos are grouped as sites having a soil pH pattern that is different than the other localities, forming the classes A, C and D, respectively. Los Patos, Platon, Monteada Nueva, La Cienaga and Bahoruco are located in class B and are characterized as having a moderately to strongly acid soil pH.

Soil test interpretation and management recommendations

The sites were segregated into five groups based on chemical properties: class A (La Lanza), class B (Los Patos, Platon, Monteada Nueva, La Cienaga and Bahoruco), class C, (Polo), class D (Los Charquitos) and class E (El Pino, Chene, Maria Teresa, Los Leonardos, Breton, Santa Elena and Las Guazaras).

Soils from La Lanza (class A) had near favourable pH and OM, and adequate Ca availability. The main soil fertility constraint in these soils is low K and Mg availability as these are below suggested critical levels. Because the exchangeable Ca availability is very high in relation to Mg and K availability, as evidenced by Ca/Mg and Ca+Mg/K ratios. The soils may benefit from the addition of fertilizer containing moderate Mg and K concentrations. The soils had adequate P and micronutrient availability, thus supplementation with these may not be needed.

Soils from class B, were generally acid, with adequate soil OM and total N contents. Coffee orchards in soils from Monteada Nueva, La Cienaga, and Los Patos may not need repeated P applications, yet P deficiency may be encountered in soils from Platon and Bahoruco. These soils are adequately balanced in terms of exchangeable basic cations, but may need to be supplemented with K and Mg. Monteada Nueva, La Cienaga and Bahoruco locations have low soil pH with values of 4.79, 4.51 and 4.53, respectively, and is in accord with observations by Almonte (2008), for some coffee production of soils of Barahona. These soils may require moderate lime (2 - 3 ton/ha) applications on a yearly basis. The soils of the above-mentioned locations are continually subjected to intensive processes of weathering due to steep slopes and rainfall greater than 2000 mm. Thus special soil conservation practices need to be included in future plantings and/or coffe tree replacement programs.

Soils from Polo and Los Charquitos localities were grouped together as a class C and D, respectively. These groups had similar soil fertility characteristics, yet differed in the sense that Los Charquitos had higher soil OM and total N contents. Soil test P was in the medium category. The main soil fertility constraint in these soils appeared to be the high soil pH which may influence micronutrient availability. In fact these two groups of soils were the ones (along with Breton) that had low soil Fe, Mn, and Zn availability. Although, exchangeable Ca was high, Mg and K were at or above sufficiency levels in Los Charquitos, so that Mg and K are not expected to be limiting crop production.

Soils from Polo may need supplementation with K. Fertilizer recommendations for these groups of soils should include formulations having moderate P, K, and Mg concentrations, and should contain special blends of micronutrients. Nutrient management in these soils should consider sources that have the potential to increase soil acidity such as organic residue application, fresh manures,and ammonium-based fertilizers. El Pino, Chene, Maria Teresa, Los Leonardos, Breton, Santa Elena and La Guazara localities are grouped together as class E. These soils had pH values near the upper limit of the desirable range (mean of 6.59). Breton locations soils are the exception having a mean soil pH 7.11. In soils of this class, exchangeable Ca and Ca/Mg ratios are outside the upper limit of the target range (> 5 and 2-10, respectively), so there may be an antagonistic effect between Ca and Mg, which could be limiting Mg utilization. The application of Mg should be considered in these soils either as individual fertilizer Mg sources or with complete formulations. The soils from all locations had favorable soil OM content and total N content. Coffe growing in all locations is expected to respond to P application originating from fertilizer or organic residue sources. Soils in these locations should not be limited, fertilizer application should not contain or contain minimum amounts of Ca, and may benefit from having moderate Mg and K concentrations.

The main constraints to coffee production in the Barahona province are low soil pH and N availability. Soils with pH below 5.5 should be limed to reduce the potential of Mn and Al toxicicity, improve base saturation, and ECEC. The application of lime can be used to provide both Ca and improve soil pH in acid soils. In areas were soil reaction does not need to be correcterd but Ca supplementation is needed, gypsum (CaS04'xH20) can be used. Coffee cultivated soils in the province of Barahona are not considered saline, so it is expected that coffee yields are not influenced by this condition (Montico, 2006).

Most of the areas sampled had relatively high accumulation of plant material as mulch on the soil surface. As the material decomposes it becomes part of the soil OM, and most of the soils from all locations had high soil OM contents. In-spite of this fact, it is not expcted for the organic matter to supply sufficient nutrients (especially N) to sustain high yields, due to the lack of synchronization in N mineralization and plant uptake, and the large amounts of N that are needed by coffee to sustain high yields. Since since total N is not a reliable indicator of N availability, N management practices should be based on expected yields and site-specific empirical assessments between fertilizer N application and economic crop response. Research in Puerto Rico has shown that yields of about 1,500 kg/ha of coffee can be obtained with 200 kg N/ha/ yr in years of good rainfall, and application of 300 kg N/ha/yr can maintain production of 3,000 kg ha-1 year of coffee (Abrurla et al, 1959; Abrurla et al, 1965; Vicente-Chandler et al, 1968). These fertilizer N recommendations need to be evaluated based on current N fertilizer prices and on-farm bean selling price.

Soil fertility depends on many factors, among them the soil OM, because it contributes to an increase in soil CEC which can serve to retain and increase the reserve of soil cations, improves soil structure physics and soil water relations (Torres et al, 2006). Soils with higher OM content are associated with increased population and diversity of microorganisms (Brechelt, 2008). A practice that is beneficial to increase levels of soil OM is the management of shade trees by pruning. Although some shade trees provide additional income by harvesting fruit, N-fixing species are those that will be most beneficial for increasing soil OM (Marques et al, 2003). The selection of the shade tree and the management of it are important factors to consider in the establishment of sustainable coffee production of high yields. Montenegro (2005) reported that the association of inga (Inga vera) and poppy (Erythina poeppigiana) are very favorable for nitrogen fixation in the coffee. The application of compost and planting of vegetatative cover are other alternatives to improve the supply of OM. Although Perez et al (2008), highlights the difficulty of balancing a program based solely on organic amendments because the inability to match crop uptake to nutrient supply. Organic amendments have other positive soil functions such as improving nutrient use efficiency and in improving water availability Marques et al (2003).

 

CONCLUSIONS

Duicela (2002) has shown that knowledge of the soil physical and chemical characteristics under coffee production can be used to identify potential production areas, facilitates the interpretation of the nutritional status of the crop and can be used to make specific recommendations about nutrition management of coffee. We determined a minimum set of soil variables that are used as indicators of soil fertility. The minimum set of indicators represent those that should be taken into account in management plans coffee nutrition. A PCA permited the selection of variables and the grouping of locations into five class coffee soil to facilitate differentiated from managing crop nutrition. This allowed for making broad infererences as to the potential soil fertility problems as well as general recommendations.This process contributes to the sustainability of the coffee industry in the province of Barahona and improving the productivity of coffee farms.

 

ACKNOWLEDGMENTS

We acknowledge the technical staff of the Dominican Coffee Council (Barahona, Pedernales, Bahoruco and Independence), the Spanish International Cooperation Agency for financing the study through project PROTESUR, Also, a staff of IDIAF-PROTESUR with a presence in Palo Alto Experimental Station South Center IDIAF for your contributions.

1http://es.wikipedia.org/wiki/Barahona_(Rep%C3%BAblica_Dominicana)

 

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