The article is validate the influence on moisture characteristic, soil compactness, biological and vegetal characteristic of summer maize by new soil amendment use field experimentation of corn.
通过大田玉米试验，验证新型土壤改良剂对夏玉米生育期土壤水分、紧实度及玉米生理生长特性的影响。
By measuring different kinds of soil with different compactness and moisture content, the authors put up a new law of SX water-retardation in a state of instantaneous impulsion.
对不同压实度、含水量的土壤进行了测定，提出了在瞬态冲击下，存在新的SX水滞规律。
The signal of instant vibration testing for soil compactness is analyzed both in time domain and frequency domain. Some feature parameters reflecting the characteristics of the signal are extracted.
从时间域和频率域两个角度对土密实度瞬态振动测试信号进行了分析，提取了信号的特征参量。
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