【摘要】 以汕优63和武育粳2号露白的芽谷为材料,研究了水稻旱育秧的出苗临界土壤水分指标及土壤保湿技术。主要结果:①不同类型品种间出苗所需的土壤水分不同,汕优63出苗的临界土壤水分值明显高于武育粳2号。②以能够出苗所需的土壤水分最低值为生物学出苗临界土壤水分指标;以在一定时限内达到一定出苗率所需的土壤水分最低值为农学出苗临界土壤水分指标。③播种后必须盖土、覆膜,进行土壤保湿。更多还原

【Abstract】 In order to improve the emergence and survival of dryraised rice seedlings, the critical soil moisture and techniques for preserving soil moisture were studied with germinated grains of rice cultivars Shanyou 63 and Wuyugen 2. The main results were as follows;1. The necessary soil moisture for emergence differed between different cultivars: much higher for Shanyou 63 than for Wuyugen 2.2. It is proposed that the minimum soil moisture necessary for emergence be the biological critical moisture and that necessary for a definite emergence percentage in a definite time be the agronomic critical moisture.3. To achieve normal emergence, the soil at sowing should reach the agronomic critical moisture which varies with rice varieties,and the seeding bed should be covered with soil and plastic sheets after sowing to preserve soil moisture.更多还原