Studies on the soil displacement by rotary tillage. II. The application of electrical conductivity method for the estimation of displacement rate of the soil tilled by rotary tillage.
Studies on the soil displacement by rotary tillage. II. The application of electrical conductivity method for the estimation of displacement rate of the soil tilled by rotary tillage.
复制标题
旋耕土壤位移研究.
DOI：
10.4035/jsfwr.25.13
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Chikara Yamamori
中科院分区：
文献类型：
--
作者：
S. Moriizumi;N. Hayashi;Chikara Yamamori
本文讨论了旋耕土壤位移率的两种计算方法。本文介绍了应用该方法估算顺向旋耕和逆向旋耕土壤置换率的结果。结果表明：（1）自然条件下旱地土壤电导率为74.6-399.0μS/cm，不同旱地土壤电导率差异显著; 2）通过耕前和耕后电导率的比较，证实了旋耕前后土壤电导率的变化; 3）在旋耕试验中，耕后土壤电导率在各测点（b2-b4点）之间变化较大，达到稳定。由于土壤电导率的变化，其变化幅度也明显大于旋耕。4）条件不等式法在一定范围内计算土壤位移比。根据本实验结果，其范围为± 1.1%以内的值。5）三元方程组法与条件不等式法计算的土壤含水率除一种情况外，最大相差0.5%。6）综合本文的各种试验结果，KCl混合土电导率法是估算旋耕土壤位移率的有效方法。
We discussed two methods to calculate displacement ratio of the soil tilled by rotary tillage in our first report. The present report is concerned with the results of application for the estimation of displacement ratio of the soil tilled by down-cut and up-cut rotary tillages. This paper also deals with the distribution of electrical conductivity on the soils in various upland fields.The results are as follows.1) The electrical conductivity of soil at the upland fields under the natural condition showed the value of 74.6-399.0μS/cm and the each field differed remarkably in electrical conductivity. This result was caused by the remaining rate of electolyte produced by chemical fertilizer.2) From the comparison of electrical conductivity before tillage with one after tillage, the soil displacement in the backward and forward by rotary tillage was confirmed.3) The large variation of displace-ment ratio of the tilled soil was observed between mesuring points [b2-b4 points to stabilize originally] in up-cut rotary experiment. The variation was also remarkably larger than one of down-cut rotary tillage, because of the variation of electrical conductivity of soil mixing KCI.4) In case of the method by conditional inequality, the ratio of soil displacement is calculated with a certain range. According to the results of this experiment, its range was the value within ±1.1%. This degree of ranges are practically negligible.5) The difference of soil displace-ment ratio between the method by simultaneous equations of three unknowns and conditional inequa-lity was 0.5% at the most except one case. Therefore, we think that validity of the both methods was proved.6) Synthesizing the various experiment results of this parper, the electrical conductivity method used the mixture soil of KCI is effective as method to estimate the displacement ratio of soil tilled by rotary tillage.