Plant growth regulator losses in cotton as affected by adjuvants and rain

Ciência Rural

Fábio Rafael Echer¹  Ciro Antonio Rosolem¹ 

[1] ,Universidade Estadual Paulista (UNESP) Departamento de Produção Vegetal Botucatu SP ,Brasil

关键词: Gossypium hirsutum;    Plant height;    Mepiquat chloride;    Chlormequat Chloride;    rainfall;    Gossypium hirsutum;    regulador vegetal;    Cloreto de Mepiquat;    Cloreto de Chlormequat;    chuva;   

DOI  :  10.1590/S0103-84782012005000120

来源: SciELO

【 摘 要 】

Most of Brazilian cotton is produced in regions where annual rainfall exceeds 1,500mm, hence plant growth regulators (PGR) may be washed from the leaves before being absorbed. The objective of this research was to evaluate mepiquat chloride and chlormequat chloride washing from cotton leaves by rains occurring at different moments post spraying. The experiment was conducted in a greenhouse. Both PGR were sprayed to cotton at pin-head square at 15g ha-1 a.i. with and without a silicon-based adjuvant, and simulated rains were applied at 0, 0.75, 1.5, 3.0, 6.0, 12.0 and 24 hours after spraying, plus a control without rainfall. Addition of silicon adjuvant increased PGR uptake. Rainfall occurring up to 24 hours after spraying resulted in some PGR loss from cotton leaves, mainly in the absence of the adjuvant. The decreased uptake implies that in order to achieve the desired level of growth reduction, at least a fraction of the original PGR rate should be reapplied.

【 授权许可】

CC BY   
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