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Changes in phytic acid concentration, free phosphorus and soluble iron during fermentation of white cabbage and Chinese cabbage

Abstract:

The anaerobic decomposition of livestock manure could generate useful agricultural subproducts as organic fertilizers. Thus, fertilization of leaf surface produced from organic nutrients and microorganisms constitutes a source for the nutrition and production of crops. This study aimed to evaluate the effect of a liquid amendment made from the anaerobic decomposition of cow manure on the foliar surface of in situ fine aroma cacao (Theobroma cacao) in Morona Santiago, Ecuador. For this purpose, we took leaf samples before and after applying the foliar amendment. Furthermore, we performed a complete randomized block experiment with five treatments. Treatments were as follows: T1 and T3 with applications of liquid amendment every 30 days and concentrations of 50 and 100%, respectively; T2 and T4 with applications every 60 days and concentrations of 50 and 100%, respectively and T5 with conventional management (Control). Results showed statistically significant differences before and after applying the liquid organic amendment on the increase of macronutrient phosphorus, potassium, and the micronutrient copper. In addition, the application of foliar fertilizer, evidenced positive effects on the in situ control of Moniliophthora roreri and M. perniciosa with the treatment of 30 days and a 50% concentration. We suggest that applying foliar amendment from cow manure decomposition contributes to the increase of macro and micronutrients of the leaves in cacao crops, also as a potential biocontrol for fungal pathogens that affect fine aroma national cacao.