Green manure and its influence on bean (Phaseolus vulgaris L.) in agroecological system

Abstract

Green manures have been used as biomass producers and suppliers of nutrients and keep the soil productive potential in tropical regions. The objective of this study was to evaluate the production of dry biomass and nutrient concentration and accumulation in plants of green manure in two cropping systems, without associating and associated with millet and its influence on the nutritional status of the bean (Phaseolus vulgaris L.) in succession in agroecological production. Four legumes (Canavalia ensiformis Adans; Cajanus cajan (L.) Millsp.; Crotalaria juncea L.; Mucuna pruriens (L.) DC) and one grass (Pennisetum glaucum L.) as association plant, were evaluated. A randomized block design was used, with eight treatments and four repetitions. The green manure plants were cut and left on the ground at 60 days after planting and bean was planted 20 days after cutting the manure plants. The evaluated variables were dried biomass production, nutrient content of green manure and nutrient content in leaves of beans in succession. The production of dry biomass of green manure was higher than 9.00 t ha-1. Mucuna stood out with the greatest tenors of N, Ca, Mg, pork beans with the highest tenors of K, Cu, Mn. The greatest accumulation of P, K and Ca nutrients was in pigeon pea. The highest values of N and Mg were obtained in mucuna. Higher C / N relation was obtained in rotalaria.

Keywords

• agroecosystem
• leaf analysis
• crop association
• legumes
• soil management