Estratégia utilizada para maximizar a eficiência de uso do nitrogênio na cultura do feijão-caupi

Abstract

In the Northeast of Brazil, beans are presented as an essential food in the diet of its population, becoming the staple dish of classes with lower purchasing power, and fertigation emerges as a promising option due to its high efficiency in the use of water and energy. The experiment was conducted in a greenhouse at the Agrarian Engineering and Sciences Campus of the Federal University of Alagoas. Data on plant height and number of leaves were collected periodically at the following times: 15, 30, 45, 60 and 75 DAP for each plant. The production variables number of pods per plant, weight of pods per plant, weight of grains per pod, fresh mass of the shoot and dry mass of the shoot were evaluated at 75 DAP. The statistical design used with a 3x2 factorial scheme, with 4 repetitions. The objective of this experiment was aimed at analyzing the performance of cowpea subjected to different nutrient splitting conditions via fertigation that enable the improvement of understanding of the crop's response and the definition of its water and nutritional requirements. The installment of nitrogen doses throughout its development cycle proved to be efficient in the strategy of maximizing the use of nitrogen through application via fertigation with a significance of 1% probability of error at 30 DAP. The dose of 30 kg ha-1 had the greatest effect on the number of leaves at 30 DAP.