Produtividade de milho irrigado por pivô central em Cachoeira do Sul - RS

Abstract

Irrigations in crops sensitive to water deficit, increase the chances of high yield. However, these should be handled well to obtain maximum utilization of the applied water layer. The objective of this work was to evaluate the productivity of corn irrigated by center pivot, through the water availability, the morphological analysis of the plants and the analysis of the components of yields. The study was carried out in a commercial plantation in Cachoeira do Sul - RS, in the agricultural year of 2018/2019. The corn hybrid BG7318 YH was sown in a no-tillage system on August 5, 2018, with 0.45 m line spacing and a population of 78,000 hectare−1 plants. For to monitor soil water content, FDR sensors were installed in the pivot irrigated area and in the rainfed area (pivot edge). The total amount of supplemental irrigation was applied by the center pivot of 119.35 mm for an increase in the number of grain row−1 and weight of a thousand grains, which resulted in a higher yield of irrigated corn reaching 18000.7 kg ha−1, while the dryland portion was significant less than 12421.7 kg ha (-1)..This evidence that corn productivity is affected by soil water availability and that supplemental irrigation, even for years with good rainfall volumes (1036 mm accumulated in the cycle) that surpassed crop evapotranspiration (accumulated in the cycle of 541.7 mm ), bring productivity increase that was 31%.