灌溉和施肥对昭林6号杨1年生扦插苗生长的影响

通过灌溉和施肥试验,对内蒙古赤峰市昭林6号杨(Populus×xiaozhuanica W. V. Hsu et Liang cv.'Zhaolin-6')苗木的生长规律进行了研究.结果表明:逻辑斯蒂曲线能够很好地模拟苗木生长过程,苗木生长速率变化的高峰出现在扦插后的第3个月至第4个月之间;钾肥对早期苗高生长速度的影响最大,其次是磷肥、氮肥;氮肥能延缓达到极大值之后的苗高减少速率;扦插后的前2个月苗木对水分要求不严,但是12周左右,水分开始显著影响苗高生长.

Effects of Irrigation and Fertilization on Growth of Zhaolin-6 Poplar Seedlings

An irrigation-fertilization experiment was conducted to study the growth rule of Zhaolin-6 polar ( Populus × xiaozhuani-ca W. V. Hsu et Liang cv. 'Zhaolin-6' ) seedlings in Chifeng City, Inner Mongolia. Results showed that the seedling growth process could be well described by Logistic curve, and the peak of growth velocity appeared during the third month and the fourth month. Potassium had the most obvious effect on height growth of seedlings at early growth stage, and then followed by phosphorus and nitrogenous fertilizer. Nitrogenous fertilizer was helpful to inhibit reduction in height growth of the seedlings after they reached the maximum value of height increment. In the first two months after planting, the seed-lings did not show much dependence on water requirement; however, water began to have significant impact on the height growth of seedlings in the twelfth month.