Nodulation and N2 fixation by Inga jinicuil, a woody legume in coffee plantations, 2: effect of soil nutrients on nodulation and N2 fixation
1981
Kessel, C. van | Roskoski, J.P. (Instituto Nacional de Investigaciones Xalapa, Veracruz (Mexico))
The effect of soil nutrients on nodulation by Inga jinicuil, a leguminous tree used for shade in Mexican coffee plantations, is discussed. Nodulation and C(,2)H(,2) reduction of I. jinicuil seedlings, grown in soil, taken at different distances from coffee trunks, is described. Nodule biomass and activity are compared to the nutrient content of soils within various distances of coffee trunks. Seven coffee plantations, that employ I. jinicuil for shade, were examined with respect to nodule biomass, C(,2)H(,2) reducing activity, and soil characteristics. Highest nodule biomass was observed in soils with high levels of available phosphorus. High nitrogen content of the soil, on the other hand, appeared to be correlated with low nodule biomass. Potassium and magnesium, while apparently having little effect on nodule biomass, seem to be positively correlated with C(,2)H(,2) reduction.
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