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改良土壤盘法又名打拔法,是一种新的作物根系調查法。它的优点是:1.作业效率高;2.在田间可以不挖大穴,自由取样,多点調查;3.作物生育期间,能同时采取多量样品,加以保存,以便有充分的时間进行調查;4.操作簡单,容易熟練,人为差誤较少。缺点是:1.观察土壤和根系之間的微細关系較难;2.在操作肘,根的形态及方向等微细部分容易移动。改良土壤盘法的具体操作方法如下:
Improved soil disk method, also known as pull the law, is a new method of crop investigation. Its advantages are: 1. High work efficiency; 2. Can not dig large holes in the field, free sampling, multi-point investigation; 3. During crop growth, can take a large number of samples at the same time, to be saved in order to have sufficient time to investigate ; 4 simple operation, easy to skilled, less human error. Drawbacks are: 1. Observe the fine relationship between the soil and the root system more difficult; 2. Elbow operation, the root shape and direction of the fine parts such as easy to move. The specific method of improving the soil disk method is as follows: