一.引言水稻在水层灌溉条件下的生长,发育和产量均优于在无水层状态(湿润灌溉)。但对抗旱性较强的陆稻(亦称旱稻)和耐澇性强的淀稻(亦称深水稻),在这方面的研究尚少。余叔文等最近对水稻和陆稻进行了比较生理的研究,他们指出:无論水稻或陆稻在水层灌溉的土壤上 I. INTRODUCTION The growth, development and yield of paddy under irrigation in the water layer are superior to those in the anhydrous layer (wet irrigation). However, there is still little research on the resistance to drought-resistant Upland rice (also known as upland rice) and waterlogging-resistant rice (also known as deep-rice). Yu et al. Recently conducted a comparative physiological study of rice and Upland rice. They point out that no matter whether rice or Upland rice are irrigated in the water layer