Economic nitrogen rate for fertigation of green corn crop in the Brazilian semiarid

Abstract

The objective of this work was to determine the nitrogen rate for fertigation associated with the maximum productivity of green corn (Zea mays) with a lower production cost, in two harvest seasons in the Brazilian semiarid region. The experimental design was a randomized complete block with four replicates, and the treatments consisted of four N rates (0, 80, 160, and 240 kg ha-1) in form of urea, applied via drip irrigation. The used cultivar was the Bt Feroz hybrid. The evaluated characteristics were: number and mass of marketable ears, gross income, net income, and rate of return. The greatest amounts of marketable ears were reached with 152.52 kg ha-1 N in summer (41,183.84 ears per hectare) and 190.31 kg ha-1 N in winter (53,291.25 ears per hectare). In the two harvests, there was a variation in production costs between R$ 2,422.12 ha-1 and R$ 3,320.95 ha-1 without N and with 240 kg ha-1 N, respectively. The winter harvest showed higher productivity and profitability of green ears with fertigation with 160 kg ha-1 N. In the Brazilian semiarid, the maximum productivity of green corn with the lowest production cost is reached with fertigation with 90 kg ha-1 N, in both harvests.

Nitrogen fertilization on the agro-economic performance of sesame in the Brazilian semiarid

“…Sesame requires high amounts of N, which vary according to the aimed production, plant nutritional state, used variety, and part of the harvested plant (Beltrão & Vieira, 2001). However, there are no known works on N fertigation in Brazil, although this technique is already being used by producers in some drip-irrigation systems in the semiarid to reduce labor costs, facilitate the application of fertilizer rates, and increase the uniformity of fertilizer distribution (Souza et al, 2019).…”

Economic nitrogen doses via fertigation for corn cultivation in a semiarid environment

“…To reduce the costs of fertilizer and labor, to facilitate parceling and reduce the loss of N by the volatilization of NH 3 and leaching of NO 3 − , the use of nitrogen fertilizers in fertigation for corn nutritional management can be a viable alternative, especially when the irrigation is delivered specifically by dripping (Sampathkumar, & Pandian, 2010;Aubert, Roozeboom, Ruiz Diaz, Gipps, & Wolf, 2016;Kumar, Rajput, Kumar, & Patel, 2016;Souza et al, 2019;.…”

Estado de nitrogênio, índice SPAD, teor de açúcar e produtividade de genótipos de milho doce (Zea Mays L. Saccharata) em função de doses de nitrogênio

“…Foi constatado que a adubação com N favoreceu as produtividades de espigas com palha e sem palha nos experimentos I (Figura 14) e IV (Figura 44), obtendo doses ótimas a partir destes pontos contatou-se redução da produtividade de espigas com as duas maiores doses de N avaliadas.O N participa de vários processos importantes para o desenvolvimento das plantas, tais como: fotossíntese, respiração, síntese proteica e absorção iônica, assim sendo, a aplicação de N nos cultivos contribui para maior produtividade e qualidade de produção do milho colhido no estádio leitoso(OKUMURA et al, 2011). Além da fertilização com N, fatores ambientais como radiação solar e altas temperaturas podem reduzir o acúmulo de N e consequentemente a produtividade de espigas verdes de milho(SOUZA et al, 2019). crescente no número de grãos por fileira da espiga até a maior dose aplicada de 150 kg ha -1 de N. Em contrapartida, SOUZA et al (2016) estudando os efeitos de lâminas de irrigação e doses de N (0, 100, 200 e 300 kg ha -1 ) nos componentes da espiga de milho doce, não observaram influência das doses de N no número de fileira da espiga.No entanto, SANDYA et al (2016), avaliando com dose ótima obtida e após este ponto houve redução da massa fresca de sabugo nas maiores doses de N no experimento I, e ajuste do modelo linear no experimento II.…”