ความต้องการน้ำและค่าสัมประสิทธิ์การใช้น้ำของอ้อยพันธุ์ขอนแก่น 3

Kobkiet Paisancharoen; Taksina Sansayawichai; Suphakarn Luanmanee; Srisuda Thippayarugs; Kasem Chusorn; Jindarut Chuenrung; Chayant Pakdeethai

ความต้องการน้ำและค่าสัมประสิทธิ์การใช้น้ำของอ้อยพันธุ์ขอนแก่น 3 | Water requirement and Kc values of Khon Kaen 3 sugarcane variety

2012

Water requirement for plant cane and ratoon cane of Khon Kaen 3 sugarcane variety was studied on Fine-loamy, siliceous Typic Kandiustults namely Warin soil series at Khon Kaen Field Crops Research Center (KKFCRC) since November, 2009 to December, 2011. Plot experimental design was RCB with 3 replications and 6 treatments, consisted of 1) No water (rain-fed condition as control) 2) Supplemental water by drip irrigation as 12.5% of available water capacity (AWC) level from 30-240 DAP 3) Supplemental water as 25.0% of AWC 4) Supplemental water as 37.5% of AWC 5) Supplemental water as 50.0% of AWC and 6) Bare soil. Weekly crop water uptakes for sugarcane and soil evaporation were recorded from the plots of 9x9 m and the crop coefficient (Kc) was re-derived. Reference crop evapotranspiration (ETo) was also determined using Blaney-Criddle (FAO) method from daily weather data gathered from the KKFCRC agro-meteorological station with 0.3 km nearby the experiment. The total plant cane water consumption was 1,620 mm/crop and the average of maximum yield was obtained 35.0 t/rai at the 37.5% AWC treatment. Water use efficiency (WUE) was 74.1 cu.m/t. The locally determined Kc values were 0.34, 0.74, 1.52, and 0.83 for initial, tillering or development, grand or mid and mature (late) sugarcane growth stages, respectively. Forthe total ratoon cane consumption, was 1,703 mm/crop and the average of maximum yield was obtained 131.9 t/ha at the 25.0% AWC treatment. Water use efficiency (WUE) was 129.3 cu m/t. The locally determined Kc values were 0.69, 0.39, 0.84, 2.28, and 0.75 for initial, seedling adaptation, tillering or development, grand or mid and mature (late) sugarcane growth stages, respectively.

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