Objective

To determine the effect of chemical fertilization and the use of two bioproducts on the seed yield of Jatropha curcas (Linn.) and of the associated crops.

Materials and Methods

A complete randomized block design was used. Nine treatments were studied: T1 (control)-without application of fertilization, T2-300 kg/ha/year, T3-600 kg/ha/year, T4-IHPLUS®, T5-FitoMas-E, T6-300 kg/ha/year + IHPLUS®, T7-300 kg/ha/year + FitoMas-E, T8-600 kg/ha/year + IHPLUS® and T9-600 kg/ha/year + FitoMas-E. The productive variables of J. curcas and the yields of the associated crops Cucurbita maxima Duch and Phaseolus vulgaris L., were determined. The data were processed through a simple variance analysis. The statistical package Infostat®, version 1.1 was used.

Results

For the quantity of producing branches per plant, the highest values (14) were obtained for T6, T7, T8 and T9. In turn, T9-600 kg/ha/year + FitoMas-E recorded the highest quantity of fruits per raceme (12); while T7-300 kg/ha/year+ FitoMas-E showed the best performance for fruit and seed yield, with values of 2 405,5 and 1 796,3 kg/ha, respectively. The crops C. maxima and P. vulgaris, had productions of 7,5 and 0,7 t/ha, respectively.

Conclusions

The development of J. curcas is determined by the effect of nitrogen fertilization in this study. The increase of seed yield is possible, if 300 kg of N/ha/year of chemical fertilizers + FitoMas-E are combined, without affecting the production of associated crops.

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