Nitrogen content and nitrogen reserves in annual leaves and offshoots of apple trees undergoing foliar nitrogen fertilization

Biotemas

关键词: Amino acids;    Leaf fertilization;    N absorption;    N distribution;    Proteins;   

DOI  :  

来源: DOAJ

【 摘 要 】

Foliar applications of nitrogen (N), when needed, have been used to supplement the fertilization of fruit trees through the soil. However, information on frequency effects, N amount to be applied, and the importance of increasing N content and N reserves in the leaves and offshoots are few. This paper aimed at evaluating the effect of foliar N applications on the N content and reserves in annual leaves and offshoots of apple trees. The study was carried out in an apple trees orchard (Eva cultivar), crop 2007/2008, in the experimental area of the Polytechnic College of Universidade Federal de Santa Maria (UFSM), in the town of Santa Maria, Rio Grande do Sul, Brazil, on a hydromorphic planosol. The treatments consisted of 1 and 2 foliar applications of 0; 1.11; 2.23; 3.31; 4.41; and 5.51g of N plant-1. The results showed that foliar N applications resulted in increased N contents in the whole leaves, especially up to the 8th day after application, but they do not affect N content in the annual offshoots. Nitrogen fertilization via the leaves did not increase the total content of amino acids and proteins in the annual whole leaves and offshoots

【 授权许可】

Unknown