Soil fertility characteristics as affected by close spacing of conilon coffee plants
DOI:
https://doi.org/10.5433/1679-0359.2011v32n3p949Keywords:
Coffea canephora, Soil nutrient levels, Acidity, Sustainability.Abstract
In arabica coffee crops grown at high altitudes with lower temperatures, soil fertility can be improved by condensed spacing. However, at low lands with warmer temperatures in which conilon coffee is grown, the effect of close spacing on the soil characteristics may change. Aiming to determine the effect of coffee-trees close planting grown with or without NPK fertilization on the soil fertility characteristics, soil samples were collected (0-20 and 20-40 cm depth) within four different conilon crop spacings (2,222; 3,333; 4,000; and 5,000 plants/ha). It was determined pH, H+Al, effective CEC (t), pH 7.0 CEC (T), base saturation (v), aluminum saturation (m) values and organic matter (OM), P, K, Ca2+, Mg2+ and Al3+ contents. The analytical results were compared by Student t test and regression analysis. Conilon coffee-trees with close planting only changed soil fertility characteristics when coffee plants received annual NPK fertilization. Close planting substantially increased P and K contents and the T value in the upper soil layer and P and K contents and T, t and H+Al values in the lower soil layer.
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