Effect of seeding time and rate on triticale's response to nitrogen in southern Brazil
1991
Wietholter, S. | Peruzzo, G. | Baier, A.C. (EMBRAPA-CNPT, Passo Fundo, RS (Brazil). National Wheat Research Center)
Triticale, the first man made species with food production use, is not well known for its response to agronomic factors, particularly in Brazil. The objective of this research was to determine the effect of seeding time and rate on triticale's response to nitrogen. Two experiments were carried out in 1989, in Passo Fundo and Lagoa Vermelha, State of Rio Grande do Sul. A randomized complete block design arranged as a split-split-plot with four replications was used. Seeding dates (early, normal and late) were main plots, seeding rates (300, 400 and 500 seeds/m2) were sub-plots and nitrogen rates (0, 40, 80, 120 and 160 kg/ha) were sub-sub-plots. Part of the nitrogen rates was applied at seeding (15 kg/ha) and the remaining was topdressed in two parts: 1/3 from 11 to 17 days and 2/3 from 32 to 41 days after emergence. Cultivar used was BR 2. Seeding was done under no-tillage after soybeans, using a no-till planter. Urea was used as nitrogen source. Soil organic matter content at Passo Fundo was 4.0 percent and 6.1 percent at Lagoa Vermelha. At both sites, first and second seeding dates produced significantly higher yields than the third seeding date. The best combination of treatments in Passo Fundo was: first seeding date (July 14), 400 seeds/m2 and 125 kg/ha as maximum return nitrogen rate. At Lagoa Vermelha, the best combination of treatments was: first seeding date (July 18), 300 seeds/m2 and 92 kg/ha as maximum return nitrogen rate, assuming a nitrogen/grain price ratio of 4.5
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