CAJ | 학술논문

以-25 kPa作为土壤水势临界值,将作物-皿系数(Kcp)设为0.2,0.4,0.6,0.8,1.0,1.2六个处理, 研究了不同灌溉水量时的番茄产量、品质和灌溉水利用效率.通过经济效益评价,研究了杨凌地区无压灌溉温室番茄获得最高经济效益时的作物-皿系数.通过张力计读数变化规律,研究了利用张力计测量无压灌溉湿润体内土壤水势的特点.研究结果表明,Kcp为0.2～0.8时, 灌溉水量的增加对番茄产量影响不大;Kcp为1.0～1.2时,灌溉水量的增加能显著提高番茄产量和果实大小;Kcp为0.2时的灌溉水量能极显著提高番茄的灌溉水利用效率.在综合考虑了杨凌地区水价、番茄使用目的和市场价格波动规律后,Kcp取值1.2能获得最高的经济效益.作物-皿系数法计算灌溉水量时的滞后性特点和张力计埋设位置,是判断利用张力计监测土壤水势临界值方法有效性的两个重要因素.
이-25 kPa작위토양수세림계치,장작물-명계수(Kcp)설위0.2,0.4,0.6,0.8,1.0,1.2륙개처리, 연구료불동관개수량시적번가산량、품질화관개수이용효솔.통과경제효익평개,연구료양릉지구무압관개온실번가획득최고경제효익시적작물-명계수.통과장력계독수변화규률,연구료이용장력계측량무압관개습윤체내토양수세적특점.연구결과표명,Kcp위0.2～0.8시, 관개수량적증가대번가산량영향불대;Kcp위1.0～1.2시,관개수량적증가능현저제고번가산량화과실대소;Kcp위0.2시적관개수량능겁현저제고번가적관개수이용효솔.재종합고필료양릉지구수개、번가사용목적화시장개격파동규률후,Kcp취치1.2능획득최고적경제효익.작물-명계수법계산관개수량시적체후성특점화장력계매설위치,시판단이용장력계감측토양수세림계치방법유효성적량개중요인소.
Crop-pan coefficientis the ratio between crop water consumption and pan evapor ation. Using -25 kPa as the soil water potential threshold, and designing six tr eatments for crop-pan coefficient Kcp=0.2, 0.4, 0.6, 0.8, 1.0, 1.2, s tudy w as made on tomato yield, quality and irrigation water use efficiency under diffe rent irrigation water amount. The crop-pan coefficient which acquired highest e c onomic effectiveness was studied through the economic effectiveness analysis, wh ile the measurement character of soil water potential using tensiometers was stu died through the tensiometer reading. The results indicated that when Kcp values was from 0.2 to 0.8, the irrigation water amount had no influence on tomato yie ld, but when Kcp values was from 1.0 to 1.2, the irrigation water amou nt had significant effect on tomato yield. When Kcp value was 0.2, the irrigation water use efficiency was improved significantly. After considering w ater price, tomato using aim and market price in Yangling district, there was th e highest economic effectiveness when Kcp was 1.2. The hysteresis qual ity of irrigation water amount calculation using crop-pan coefficient and the b uried position of tensiometer were main factors to estimate the validity of tensiometer measuring the soil water p otential threshold.