Yield and profitability of flooded rice genotypes in relation to nitrogen doses and phosphorus and potassium application

Pesquisa Agropecuária Tropical

Osmar Henrique de Castro Pias¹  Felipe de Campos Carmona²  Tales Tiecher³  Amanda Posselt Martins³  Gustavo Gomes Lima⁴ 

[1] Instituto Federal de Educação, Ciência e Tecnologia Farroupilha, Júlio de Castilhos, RS, Brasil.;Integrar - Gestão e Inovação Agropecuária, Capivari do Sul, RS, Brasil. ;Universidade Federal do Rio Grande do Sul, Faculdade de Agronomia, Departamento de Solos, Porto Alegre, RS, Brasil. ;Universidade Luterana do Brasil, Canoas, RS, Brasil.;

关键词: oryza sativa;    hybrid seed;    fertilization response curve;    plant nutrition;   

DOI  :  10.1590/1983-40632020v5064561

来源: DOAJ

【 摘 要 】

The use of hybrid genotypes is a good alternative for increasing the flooded rice yield. However, there is a need for validation of the fertilizer management under different edaphoclimatic conditions and its greater profitability. This study aimed to evaluate the grain yield and profitability of rice hybrids in relation to N doses and fertilization with P and K. Five hybrid cultivars and the conventional IRGA 424 CL cultivar combined with four N doses (0, 100, 150 and 200 kg ha-1) were evaluated, all with fixed doses of 90 kg ha-1 of P2O5 and 150 kg ha-1 of K2O, besides an additional treatment without the addition of fertilizers. The N application increases, on average, by 10 and 35 % the flooded rice yield in years with favorable and unfavorable climatic conditions, respectively. Regardless of the year and genotype, the highest yields are obtained with doses of N between 106 and 200 kg ha-1, with the most profitable dose being the 150 kg ha-1 one (22 % higher than for the absence of N). The hybrids produce an average of 20 % more grains than the IRGA 424 CL cultivar, increasing the profitability by 18 %. In soil with adequate P and K availability, there is no increase in yield due to the application of these nutrients. However, in deficient soil, the fertilization with P and K increases the grain yield by 21 %.

【 授权许可】

Unknown