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该试验设置在教学试验苗圃,系永久性钢架棚,面积157.5米~2。采用火炉加温、开门揭帘通风和洒水降温。布设了不同营养土,不同容器育苗两组试验。供试苗木为油松、侧柏。试验得出:1.在同样条件下,油松的苗高、地径、根系生长量,以及干重和鲜重,棚内的苗木远远大于棚外对照,且苗木生长正常,木质化程度好。另外,通过对苗木绝对生长量、16天平均温度、苗木前期高度三者关系的线性回归计算,可以看出:绝对生长量随平均温度和前期苗高的增加而增大,在达到平均气温最高值后,生长量又随平均温度的降低而减少,其数学模型以线性分段逐数表示。由此可知,控制苗木生
The test set in the teaching experiment nursery, Department of permanent steel shed, an area of 157.5 m ~ 2. Furnace heating, open the door ventilation and sprinkler cooling. Set up a different nutrition soil, different containers nursery two groups of experiments. The test seedlings for pine, Platycladus orientalis. The results showed as follows: 1. Under the same conditions, the seedling height, diameter, root growth, dry weight and fresh weight of Pinus tabulaeformis were far greater than those outside the greenhouse, and the growth of seedlings was normal and the degree of lignification it is good. In addition, through the linear regression calculation of the absolute growth of seedlings, the average temperature of 16 days and the height of early seedling, we can see that the absolute growth increased with the increase of average temperature and pre-emergence seedling height, and reached the highest average temperature After the value, the amount of growth decreases with the decrease of the average temperature, and its mathematical model is linearly and step by step. This shows that the control of seedlings Health