Abstract
Nitrogen is the element that has the most influence on grain yield in maize plantations; however, the excess of this nutrient increases the likelihood of lodging. The occurrence of lodging can be prevented by applying a plant growth regulator. In this respect, an experiment was carried out to evaluate the effects of nitrogen sidedressing above the ideal level, associated with the use of trinexapac-ethyl in maize cv. P30R50H. The experiment was conducted under field conditions during the season 2013/2014, in Lages - SC. The experimental design was a randomized block design with four replications, and the treatments consisted of four nitrogen rates and a rate of trinexapac-ethyl applied at all nitrogen rates. Nitrogen rates were equivalent to 1.0, 1.35, 1.70 and 2.0 times the required rate to reach the yield of 12 t ha-1. The N sidedressing rates were equally divided and applied on plants at phenological stages V4, V7 and V9. The trinexapac-ethyl was applied when the plants reached V10 (ten fully developed leaves) at a concentration of 300 g a.i. ha-1. Only the variable length of the leaf opposite the ear increased with increasing the ideal level of nitrogen sidedressing. Lodging, plant height, leaf chlorophyll, grain yield and nitrogen content in the grains were not affected by N sidedressing above the ideal level, associated with the use of trinexapac-ethyl.
Highlights
Nitrogen is the element that has the most influence on grain yield in maize plantations; the excess of this nutrient increases the likelihood of lodging
Nitrogen is one of the nutrients required in higher amounts by maize plantations, and it plays an important role in increasing grain yield (LOURENTE et al 2007, CIAMPITTI & VYN 2014)
The use of plant growth regulators is a management strategy farmers can adopt to avoid excess growth and vigor of maize plants under high population density, associated with high rates of nitrogen side-dressing, when grain yield is aimed at higher levels, for example, above 18 t ha-1 grains (SCHMITT et al 2012)
Summary
Nitrogen is the element that has the most influence on grain yield in maize plantations; the excess of this nutrient increases the likelihood of lodging. The use of plant growth regulators is a management strategy farmers can adopt to avoid excess growth and vigor of maize plants under high population density, associated with high rates of nitrogen side-dressing, when grain yield is aimed at higher levels, for example, above 18 t ha-1 grains (SCHMITT et al 2012).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
