In the later stage of bearing, the stem thick of the most irrigation amount was smaller, compared to B2 and B3 .Treatment B4had the smallest stem thick.

• 随灌水量增加，茎粗有增加的趋势。 但并不是灌水量越多越好，表现在生育后期灌水量最多的处理B_1的茎粗较小，小于处理B_2与B_3，灌水量最少的处理B_4最低。