Foliar urea fertilization on cotton

• Published in: Philippine Journal of Crop Science (Philippines) Vol. 22; no. 1
• Main Authors: Orpia, P.C, Biag, L.D, Orpia, E.C. Jr. (Cotton Research and Development Inst., Batac, Ilocos Norte (Philippines))
• Format: Journal Article
• Language: English
• Published: 01.05.1997
• Subjects: ABSORCION DE SUSTANCIAS NUTRITIVAS; ABSORPTION DE SUBSTANCES NUTRITIVES; APLICACION FOLIAR; APPLICATION FOLIAIRE; CHOIX DE LA DATE; ELECCION DE LA EPOCA; GOSSYPIUM HIRSUTUM; UREA; UREE
• ISSN: 0115-463X

The study was conducted at CRDI-CES, Batac, Ilocos Norte [Philippines] to evaluate the effects of different techniques of foliar urea fertilization. The treatments were concentrations of spray solution by weight (3 percent, 6 percent, 9 percent), frequency of spraying (7, 14 d interval), time of spraying (8:00 am., 4:00 pm.), and site spraying (top leaf surface, underleaf surface). Nitrogen uptake by the plants was significantly highest when sprayed with 3 percent urea solution at 8:00 am regardless of interval of spraying. Top leaf surface and underleaf surface spraying resulted to similar N absorption. The 7 days interval spraying produced significantly taller plants, greater number of sympodial branches and higher seedcotton yield than the plants sprayed at 14 days interval. Concentration of spray solution, time of spraying and site spraying did not significantly influenced yield and other agronomic parameters taken. Spraying early in the morning at weekly interval from squaring to bolling stage appeared to be an efficient technique of foliar urea fertilization. Moreover, 3 percent spray solution concentration was better over higher levels considering the burning effect of the fertilizer at higher concentrations