N2 -种植成本降低(30%)和产量增加(40%)迫使Saurashatra农民大规模采用Bt.棉花。Saurashtra棉由于光泽好、绒毛少、纤维表面蜡多、染料吸收量低，在国际市场上获得了较高的利润。高蒸发量的条件，地下水的缺乏和不足的降雨条件是不利的棉花产量。气候变化为这种土壤-水-植物-大气的复杂关系增加了另一个维度。恶劣的环境条件和缺水引起了该地区农民的兴趣，采用Bt. Cotton膜下滴灌，以减轻气候畸变的影响。作物生长季实际蒸散量的确定，对于合理的灌溉调度具有十分重要的意义。到目前为止，还没有关于不同灌溉制度下滴灌可生物降解覆盖棉作物系数的研究报道。为此，我们连续两年(2013-14年和2014-15年)进行了实验。采用土壤水分传感器监测1.0 IW/ETc和0.8 IW/ETc灌溉条件下土壤水分随深度的日变化和时间变化。对照处理采用滴灌不覆盖。 Adjusted FAO Kc predict higher value than sensor based Kc values at both irrigation regimes. Sensor based Kc-mid values were lower by 12.99% and 30.04% than the adjusted FAO Kc-mid value at 1.0 IW/ETc and 0.8 IW/ETc respectively. Biodegradable plastic mulch reduced Kc-ini value by 72.26% and 66.54% over control at 1.0 IW/ETc and 0.8 IW/ETc respectively. Overestimated adjusted FAO Kc values caused a loss of 78.13mm and 66.54mm of precious water at 1.0 IW/ETc and 0.8 IW/ETc respectively. This study admonishes blind adoption of published FAO Kc curves, for mulch conditions. JF - Current World Environment JA - VL - 35 IS - 37 UR - www.a-i-l-s-a.com/article/918/ SP - EP - PB - M3 - 10.12944/CWE.11.2.37 ER -