Liming optimizes nitrogen fertilization in a maize-upland rice rotation under no-till conditions

• Autor(a) principal: Crusciol, Carlos Alexandre Costa [UNESP]
• Data de Publicação: 2021
• Outros Autores: Momesso, Letusa [UNESP], de Campos, Murilo [UNESP], Bossolani, João William [UNESP], Portugal, José Roberto [UNESP], Moretti, Luiz Gustavo [UNESP], Volf, Marcelo Raphael, Calonego, Juliano Carlos [UNESP], Rosolem, Ciro Antonio [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.3390/agronomy11102005; http://hdl.handle.net/11449/233636
• topic: Grass crop rotation; Lime application; Nitrogen rate; Tropical agriculture

Liming and N fertilization are common practices for optimizing crop yields in tropical agriculture, but the adequate N rate to ensure crop development, enhance yields and N use efficiency, and improve soil chemical properties has not been established for grass rotation. We assessed the optimal N fertilizer rate for combination with liming in an agricultural system composed of two grasses (maize and rice) in rotation under no-till (NT) conditions. Four N rates (0, 50, 100, and 150 kg N·ha−1) were tested under two liming conditions. Maize (11 Mg·ha−1) and rice (5 Mg·ha−1) yields were highest with lime and 150 kg N·ha−1 applications. At 18 months after liming, lime application increased soil pH. In addition, combining liming with N fertilization further increased SOM content at all N rates. Lime increased available P, exchangeable Ca2+ and Mg2+, and BS at N rates of 0, 50, and 100 kg N·ha−1. Overall, combining liming and N fertilization is beneficial for grass crops under NT conditions, as evidenced by enhanced maize and rice N use efficiency and yields. N fertilization rates of 100 and 150 kg N·ha−1 under lime amendment provided the best improvements in crop yields in this cropping system.