Abstract
The gypsum has elevated calcium and sulfur in the soil, and there are reports of increased grain yield of soybean with reduced number of plants, being necessary in conjunction with economic return on investment. This study investigated the effect of application superficial of gypsum and different numbers of plants in precision seed drill in the nutritional aspect of the leaf tissue, grain yield of soybean cultivated in clayey Rhodic Hapludox and economic return on investment. Used in the experiment was a randomized block design in scheme tracks (4 × 4), with four doses of gypsum (0, 800, 1600 and 2400 kg ha-1) applied at the V4 stage of soybean Vmax RR (SYN 7059RR) and four variations in the number of plants (12, 14, 16 and 18 plants per meter), with four replications. Samples of leaf tissue were collected in the flowering stage of soybean in the 2011/2012 crop, and then determined the levels of Ca, Mg, K, P, S, Cu, Zn, Mn and Fe. At maturity the yield assessment was performed. The number of plants per meter with precision seed drill and superficial application of gypsum at the V4 stage do not affect the content of macro-and micronutrients leaf tissue of soybean cultivar SYN 7059RR. The application of gypsum at the V4 stage and reducing the number of plants per meter statistically do not affect the grain yield. Recommend lower number of plant (12 plants m-1) on soybean cultivar for SYN 7059RR. The economic returns using higher amount of seed (14, 16 and 18 plants m-1) is -283, -260 and -271% with investment of US$ 13.76, 29.24 and 44.72. Use of gypsum focused costs to only two cultures (soybeans and wheat) during the crop season provides residual soil of 104.43 kg ha-1 of S. Application 800 kg ha-1 gypsum provides US$ 14.56 profit with 44% economic return to payment half investment (US$ 33.32). Key words: No-till, fertilization, plant population, seeding rate, investment return
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