Supraoptimal nitrogen sidedressing on morpho-agronomic traits of maize

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 trinexapacethyl 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 trinexapacethyl.

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

“…Maize response to nitrogen fertilization depends on the amount of N available in soil, time of application and rates as well as the plant characteristics (Santos et al, 2011). There is also a distinct response of maize genotypes to nitrogen fertilization (Fagherazzi et al, 2016). Nitrogen fertilization must be well managed to achieve optimum efficiency of use, considering the growing concerns about nitrate pollution in the environment, especially in water bodies, due to improper management of nitrogen fertilization (Duete et al, 2008).…”

Prohexadione-Calcium and Nitrogen Topdressing Fertilisation on Productive Performance of Maize with Late Sowing

“…However, the behavior may be unfavourable because minors EH are associated with a lower risk of lodging in crops [21,22]. The plant of lodging, plant height, leaf chlorophyll, grain yield and nitrogen into grains were not affected by fertiliser N sidedressing above the ideal level combined with the use of trinexapacethyl [23]. Nitrogen is the nutrient that has the greatest influence on grain yield in maize, however, the excess of this nutrient increases the plant sensitivity to lodging; but lodging occurrence can be minimised due use of a mixture of the plant growth regulators ethephon and diethyl aminoethyl hexanoate (DA-6), called EDAH [24].…”