Influência da altura da lâmina de água sob o desempenho da produção na cultura do arroz irrigado

Abstract

Rice (Oryza sativa L.) is considered the staple food for about 2.4 billion people, is the product of greater economic importance in many developing countries. Water management is one of the most important in Rice yield factors. In the pre-germinated cultivation as in other systems of cropping system, the blade height of water emerges as an issue to be resolved if this influences yield components of rice. In this sense, the objective of this study is to evaluate the influence of blade height of water in the performance of two cultivars in different planting densities in pre-germinated cultivation in the Fourth Cologne / RS system region. The experimental design was a randomized block design in a factorial model with subdivided in space, consisting of the four treatments in plots heights of water level (1, 6, 11 and 16 cm) and 2 cultivars IRGA 425 and IRGA 428, subplots and three seeding (80, 120 and 160 kg.ha-1). The results show that there is the influence of the height of the water depth and seeding rate on yield components of cultivar IRGA 425. The grain yields, IRGA 425 and IRGA 428 answered the influence of blade height of water and seeding rate. Yielded the best results in IRGA 425 in blade height of 6 cm water and seeding rate of 80 kg.ha-1, and IRGA 428 in blade height of 11 cm water and sowing density of 80 kg.ha-1.