Nitrogen fertilization recommendation for corn cultivated under no-tillage

Abstract

The amount of nitrogen (N) suggested for corn crop must meet its demand, maximizing yield and minimizing losses. Therefore, the objective of this study was to determine the recommendation of N fertilization for corn grown under no-tillage, using the method that considers the availability of N from the soil, the N requirement for the crop to reach the projected yield and the N-fertilizer recovery efficiency. The experiment consisted of four doses of N (0, 30, 70 and 95 kg ha-1), arranged in randomized blocks, with five repetitions. N stock of 4,357.90 kg ha-1 in the 0-20 cm soil layer provides corn plants with 52.83 kg of N ha-1, corresponding to a mineralization coefficient of 1.2%. The N-fertilizer recovery efficiency and the harvest index show a progressive linear increase according to N doses. In projections of yields lower than 1,000 kg ha-1, N fertilization is not necessary; however, in corn cultivation under no-tillage aiming at yield above 5,000 kg ha-1, fertilization needs to be performed with doses above 100 kg of N ha-1.

Stover return and nitrogen application affect soil organic carbon and nitrogen in a double‐season maize field

“…2020). Previous studies have shown reduced N application reduces the harvest index during production, while higher amounts of N fertilizer can increase maize vegetative growth, but reproductive growth is reduced (Silva & Souza, 2020). Guo et al .…”

“…In agricultural production, appropriate N application is conducive to the vegetative growth of crops, particularly for growth of roots, stem, leaves and final yield (Zhou et al 2019;Maltese et al 2020). Previous studies have shown reduced N application reduces the harvest index during production, while higher amounts of N fertilizer can increase maize vegetative growth, but reproductive growth is reduced (Silva & Souza, 2020). Guo et al (2016) found that excess N application decreased soil pH in crop production areas in China by 0.5 units from 1980 to 2000, resulting in soil acidification and reduced production of organic matter (Liang et al 2013;Wang et al 2021a).…”