Effect of Variable Water Application on Cotton

• Main Authors: Rezaee, Moslehedeen, A'rabi, Mojtaba, Moshkel Gosha ,Narges, Nezafat,Khalil
• Format: Publication
• Language: Persian
• Published: Isfahan(Iran) Isfahan Agricultural and Natural Resources Research Center 2006
• Subjects: AGUA; ALGODON; APPLICATION METHODS; CONTENIDO DE HUMEDAD; COTON; COTTON; EAU; http://www.fao.org/aos/agrovoc#c_1926; http://www.fao.org/aos/agrovoc#c_3957; http://www.fao.org/aos/agrovoc#c_4886; http://www.fao.org/aos/agrovoc#c_542; http://www.fao.org/aos/agrovoc#c_8309; http://www.fao.org/aos/agrovoc#c_8488; IRRIGATION METHODS; METHODE D'APPLICATION; METHODE D'IRRIGATION; METODOS DE APLICACION; METODOS DE RIEGO; MOISTURE CONTENT; RENDEMENT; RENDIMIENTO; TENEUR EN EAU; WATER; YIELDS

In surface irrigation method, the allowable moisture depletion level is required for irrigation schualing (timing and amount of water application) and determination of irrigation water requirement. The effect of factorial combination of 50, 70 and 90 percent available water depletion before and after flowering stage on yield, yield component and vegetative growth of cotton (Varamin Cultivar) in a silty clay loam soil using a complete randomized block -designed in four replicates in the flood plane of Zayndeh-Roud River during 1995-1997 growing seasons (OS). The mean seed-cotton yield in, 95, 96, and 97 OS were 1.6,3.59 and 3.73 Mg ha¬l, weight of boll, were 4.2,5.36 and 5.05 gr boll", number of boll per plant were 6.47, 8.83, 9.93, the final plants height were 59.4, 79.2, 65.5 em and, percent ground cover were 62.9, 75.9,74.6 respectively. The effects of soil water depletion levels after flowering stage on yield; yield component and vegetative growth were higher than pre¬flowering stage. The effect. of moisture depletion treatment after flowering stage on seed-cotton yield in 95 and 96 GS, plant height in 95, 96 and 97 OS, number of boll per plant in 96, 97 OS were significant (0.01 P), and before flowering stage in 96 GS on seed¬cotton yield, in 95 and 96 GS on plant height, in 97 on number of boll per plant and boll weight were significant (0.05p). The 50 percent available water depletion treatment before and after flowering stage (50-50) resulted in the highest yield, but it was not significantly different from 90-70 treatment. The highest and lowest water use efficiency (seed-cotton/applied water) was obtained from 90-70 and 50-50 treatments. Considering the results 2 to 3 times irrigations before flowering stage and, 5 to 6 times irrigation in 12-16 days intervals after flowering stage, and wetting the soil to 60 em before flowering stage and 80 em after flowering stage is recommended (800 to 900 mm water) for economical seed-cotton production, considering limited water resources in the area. Keywords: depletion, moisture, cotton, stage, irrigation