Performance of soybean grown in succession to black oat and wheat

Abstract

The objective of this work was to evaluate the influence of isolated or combined roots and straw of black oat and wheat, as previous crops in autumn/winter, on the performance of soybean in succession. The experiment was carried out in the 2017/2018 and 2018/2019 crop seasons in a randomized complete block design, with four replicates. The following seven treatments were applied in the autumn/winter of 2017 and 2018, before soybean planting: fallow; straw of black oat or wheat, distributed on plots kept under fallow during autumn/winter, without roots; plots only with roots of black oat or wheat, without straw; and plots with straw and roots of black oat or wheat. Soybean crop performance was estimated using the following variables: plant density, leaf area index, soil plant analysis development (SPAD) index, shoot dry matter, grain yield, and yield components. In comparison with fallow, the cultivation of black oat or wheat, as previous crops during the autumn/winter, increases soybean grain yield. The impact of the roots of black oat or wheat on soybean yield is similar to that of straw. Soybean agronomic performance is improved in the combined presence of roots and straw of black oat or wheat.

Maize-ruzigrass intercropping, nitrogen fertilization and plant density improve the performance of soybean grown in succession

“…In 2019/2020, the ruzigrass-maize intercropping system increased soybean yield by 232 kg ha −1 compared with sole maize (Figure 4D). Such behavior may be attributed to the cumulative benefits of ruzigrass to cropping systems (Baptistella et al, 2020;Balbinot Junior et al, 2020;Garbelini et al, 2020). Furthermore, the high water supply during grain filling (Figure 1) might have contributed to intensifying differences between treatments.…”

“…Recently, farmers have reduced N fertilization of secondcrop maize (Sapucay et al, 2020) because of the high agrometeorological risk (Nóia Júnior & Sentelhas, 2020), the small response of the crop to N in this growing season (Sapucay et al, 2020), and the high cost of N fertilizers (Mergener et al, 2022). However, this management strategy may be detrimental to crop yields.…”