2019
DOI: 10.1590/0103-8478cr20180747
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Abstract: The state of Rio Grande do Sul has about 20% of the total area as lowland soils, suitable for flooded rice (Oryza sativa). In order to mitigate damage caused by rice monoculture, new crops such as sorghum (Sorghum bicolor) and soybean (Glycine max) have been cultivated in these areas. With different qualities of crop residues, it is expected a change in soil organic matter (SOM) dynamics and consequently, nitrogen (N) availability. The objective of this study was to evaluate the influence of rice, soybean and … Show more

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“…Furthermore, P 2 O 5 fertilizer and lime amount were higher in HY fields than in LY (Table 1), and in HY fields farmers are growing soybean in rotation with rice more often than in LY fields. Soybean requirements of P and lime are almost twice the requirements of rice, thus in the soybean-rice rotation extra amount of P, Ca, and Mg are available for rice (Partey et al, 2016;Pollet et al, 2019). Pre-sowing weed control by only herbicides showed 10% higher yield than disc+herbicide control (8.9 vs. 8.1 Mg ha −1 ) (Figure 6a).…”
Section: Units Hy Fields Ly Fields Hy-ly Fieldsmentioning
confidence: 99%
“…Furthermore, P 2 O 5 fertilizer and lime amount were higher in HY fields than in LY (Table 1), and in HY fields farmers are growing soybean in rotation with rice more often than in LY fields. Soybean requirements of P and lime are almost twice the requirements of rice, thus in the soybean-rice rotation extra amount of P, Ca, and Mg are available for rice (Partey et al, 2016;Pollet et al, 2019). Pre-sowing weed control by only herbicides showed 10% higher yield than disc+herbicide control (8.9 vs. 8.1 Mg ha −1 ) (Figure 6a).…”
Section: Units Hy Fields Ly Fields Hy-ly Fieldsmentioning
confidence: 99%
“…The nitrogen of mineral fertilizers accelerates the mineralization of organic matter, which contributes to the accumulation of mobile nitrogen in the soil. At the same time, with a better carbon supply, microorganisms absorb more ammonium and amino acids, and more immobilized nitrogen is accumulated in the soil [12,13]. The afore mentioned causes significantly less (in comparison with carbon) unproductive nitrogen losses associated mainly with the processes of nitrification and denitrification.…”
Section: Figmentioning
confidence: 99%