Different Soybean Plant Populations Under Central Pivot Irrigation

Abstract

Planting density can influence the competitiveness among plants mainly by water, nutrients and solar radiation, directly affecting yield. The purpose of this study was to evaluate the productivity of different soybean cultivars at different planting populations under irrigated and rainfed conditions. The experiment was conducted during the 2014/15 growing season, under center pivot irrigation in Chapadão do Sul -MS, Brazil. The experimental design was randomized complete block design with split-plot, as follows: Irrigated and Rainfed (plots) x Six cultivars (subplots) x Three Plant Populations (sub-subplots) with 4 replications. The irrigation management was realized by Penman-Monteith-FAO method. The cultivars used were: NA 5909 RR, DM 5958 IPRO, Anta 82 RR, M 7110 IPRO, Desafio RR and M 7739 IPRO. Populations indicated by the holders of the seeds were tested, and also population 20% above and 20% below with the hypothesis that in different humidity conditions, different cultivars may have different answers depending on their populations. In rainfed condition productivity and mass of one hundred grains were influenced by water deficit. Cultivar Desafio RR presented the best performance under irrigation, with productivity of 6174 kg ha -1 .

Water depths for different soybean cultivars in center pivot

“…Regardless of irrigation, the cultivar M7110IPRO showed the highest values of HGW. These results corroborate those of Gava et al (2017), who evaluated the performance of soybean cultivars in different plant populations and under conditions of irrigation, and claimed that under rainfed conditions the yield and hundred-grain weight were damaged by water deficit. According to these authors, irrigation in the soybean crop allows yield increments superior to 60% compared with rainfed conditions, making the activity feasible.…”

Water availability for high yield of soybean cultivars

“…Supplementary water application may increase yield to up to 60% in years when water deficit occurs at the grain filling stage (Gava et al, 2017). However, no water deficit was observed at the grain filling stage in neither crop season.…”

Eficiência do uso da água e resposta termal da cultura da soja submetida a diferentes níveis de reposição hídrica

“…De acordo Gava et al (2017) o rendimento da massa de grãos é prejudicado pelo déficit hídrico e a irrigação na cultura da soja permite incrementos de produtividade. Quanto ao excedente hídrico, os autores afirmam que o excesso pode não ser prejudicial, dependendo do tipo de solo e indicam a possibilidade de se aplicar lâminas de irrigação até 50% maiores que a lâmina de referência, sem causar danos às plantas.…”