Doses of N and K in tomato under saline stress: II. Plant development and dry matter partitioning

Revista Brasileira de Engenharia Agrícola e Ambiental

Folegatti, Marcos V.¹  Blanco, Flávio F.² 

[1]USP, Piracicaba

[2]Embrapa Meio Norte, Teresina

关键词: Lycopersicon esculentum;    fertigation;    leaf area;    salinity;    flowering    INTRODUÇÃO Em condições tropicais;    inclusive no Brasil;    a produção de tomate sempre foi caracterizada pela sazonalidade na oferta e baixa produtividade;    sendo que na entressafra há uma acentuação nas diferenças relativas dos índices de sazonalidade das classes de tomate;    ampliando-se a comercialização dos tomates de pior qualidade a preços supervalorizados (Ambrosio & Nagai;    1991);   

DOI  :  10.1590/S1415-43662008000100005

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The presence of certain nutrients in soil solution can stimulate the growth of plants when cultivated under saline stress. A study was conducted to evaluate the response of tomato (hybrid Facundo) to different doses of N and K under irrigation with saline water. The work was carried out in a greenhouse and the treatments consisted of the combination of three levels of N (7.5, 15.0 and 22.5 g per plant) and three levels of K (8, 16 and 24 g K2O per plant) applied by drip fertigation, in a 3 x 3 factorial scheme, with five replications. The salts sodium chloride and calcium chloride were also added to irrigation water for obtaining an electrical conductivity of the water of 9.5 dS m-1. Plant height, stem diameter, leaf area and the number of days for flowering were not affected by the levels of N and K, the levels of K affected the dry mass of stem plus clusters and total dry mass for the lowest levels of N. It was concluded that the application of high doses of N and K did not contribute to increase salt tolerance of tomato.

【 授权许可】

CC BY-NC