Effect of bioestimulant, pyraclostrobin, nitrification inhibitor and nitrogen spliting on upland rice / Efeito de bioestimulante, pyraclostrobina, inibidor da nitrificaÃÃo e parcelamento de nitrogÃnio em arroz de terras altas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

One hypothesis for the insuccess of upland rice in the no-tillage system is related to nitrogen nutrition. Probably, the main factor limiting the performance of upland rice is related to its inability to use nitrogen as nitrate in the initial phase of its development, which is the predominant form in no-tillage systems. The objective was to evaluate the effect of different forms of split N, associated to bioestimulant, to physiological effect of pyraclostrobin and to nitrogen fertilizer with nitrification inhibitor on the development of rice culture in uplands, under no-tillage system. The experiment was installed in the experimental field of Department of Agriculture, Federal University of Lavras (UFLA) and consisted of 20 treatments, which were used in all 90 kg/ha of nitrogen applied as follows: 90 kg/ha in planting; 60 kg/ha at planting and 30 kg/ha in coverage, 30 days after sowing (DAS); 45 kg/ha at planting and 45 kg/ha in coverage, at 30 DAS; 30 kg/ha at planting and 60 kg/ha in coverage, at 30 DAS; 30 kg/ha at planting, 30 kg/ha at 30 days and 30 kg/ha at 50 DAS, combinated or not with bioestimulante, pyraclostrobin and inhibitor of nitrification. The experiment was carried under no-tillage system, using experimental delineations of randomized blocks with four repetitions. Each plot was constituted of five rows of 5 m, spaced 40 cm between rows and seeding density of 80 viable seeds per meter, using BRSMG Caravera cultivar. The characteristics evaluated were grain yield, plant height and number of panicles/mÂ. In the conditions of this experiment, the bioestimulant, the pyraclostrobin and the nitrification inhibitor did not influence the grain productivity, the plantâs height and the number of panicles per m on upland rice. The nitrogen splitting positively affect the grain productivity, the plantâs height and the number of panicles per m on upland rice. The nitrogen splitting in three applications (sowing and two coverages) was the one that most contributed to elevate grain productivity, on upland rice under no-tillage system.

ASSUNTO(S)

oryza sativa nitrogÃnio fitotecnia nitogen oryza sativa plantio direto no-tillage

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