Atributos químicos do solo e produtividade da soja após milho, braquiária e feijão-caupi em latossolo na região do cerrado

Abstract

The objective of this study was to evaluate soil chemical attributes and yield components of soybean after maize, brachiaria and cowpea in an oxisol in the Cerrado region. The experiment was carried out at Embrapa-CPAO experimental area in Dourados-MS, Brazil, in the 2014/15 crop year, in a clayey dystroferric Red Latosol under no-tillage system (SPD). The experimental design was in randomized blocks with split plots with four replications. The soil chemical evaluations were carried out in soybean R1stage, being considered as the main plot the fall-winter crops (Brachiaria ruziziensis, safrinha corn, intercropping with B. ruziziensisand cowpea) and the subplots as soil depths (0-10; 10-20; 20-30 and 30-40 cm). For soybean yield components, fall-winter crops and subplots were soybean cultivars (BRS 284 and BRS 360 RR). In general, previous soybean crops in SPD provided higher contents of some nutrients at depths from 0 to 10 cm, in addition to higher cation exchange capacity, base saturation and soil organic matter. Cowpea, safrinha corn and B. ruziziensisprovided conditions for higher soybean yield. BRS 284 presented higher number of grains per plant, however BRS 360 RR proved to be more productive.

Cowpea, sunflower, sorghum, pearl millet and showy ratllepod for Pratylenchus brachyurus management on soybean

“…In trials 4 and 5, GW after cowpea was lower than after showy rattlepod and did not differ from corn (susceptible host). Currently, cowpea has been widely used as a second crop for grain production in the Brazilian Cerrado region (Pires et al 2018;Ribeiro et al 2020), which is heavily infested with P. brachyurus.…”

“…Pires et al (2018) proposed cowpea after soybean in Maranhão state, in areas usually maintained in fallow, to enhance farm income and contribute to soil conservation. Ribeiro et al (2020) obtained similar soybean yield in a succession with cowpea 'BRS-Guariba' in comparison with corn (Zea mays L.) and Kennedy ruzigrass [Urochloa ruziziensis (R. German and Evrard)]. More than 30 years ago, P. brachyurus was reported as a widespread and important nematode in cowpea fields (Ponte 1987).…”