培育青杨速生丰产林是一项新的工作,为了逐步掌握促进生长的规律,我们对林木需要水分和养分的生理指标作过一些初步测定,以便根据植物本身的需要来进行灌溉和追肥。一、叶细胞吸水力的测定:以细胞汁浓度作为植物的水分生理指标,是常用的方法,但折光仪不易购置,而细胞吸水力的测定不 To cultivate the fast-growing and high-yielding evergreen forest is a new work. In order to gradually grasp the law of promoting growth, we have made some preliminary measurements on the physiological indexes that require water and nutrients for the forest to be irrigated and topdressing according to the needs of the plant itself. First, the determination of leaf cell water absorption: the cell juice concentration as the plant’s water physiological indicators, is a commonly used method, but the refractometer is not easy to purchase, and the determination of cell absorption is not