Comparative studies on crop root response to rheological traits in soil.

实地实验已经被转移到澄清土壤表面在土壤表面上的差异和关键因素的速率，在土壤表面上的速率。在不同的品种之间有明显的差异。低种子稳定率存在于年轻阶段的浮动和种子死亡率的主要原因。These two causes were independent of each other。如果在浮动种子和植物长度的百分比之间找到了明确的相关性，或者在水中种子的一半根长度或一定的重量，那么有报告称将成为在贫穷种子建立中浮动种子的原因。根提示旋转是用光谱分析分析的室内生长种子：使用的最大入口法（MEM）。MEM spectrum analysis clarified that maximum power density detected in the frequency range above 0.1 cycles mm的D1-1 mi D1 was highly and positively correlated to seedling establishment percentage in the field experiment。从结果来看，用一个更大的螺旋角进行根尖端旋转，建议在被淹没和非常柔软的土壤上扮演一个重要的角色。带有螺旋根生长的大角度的种子百分比是通过使用IRRI核心收藏中的76种变体对中等尺寸（10- 20 cp）进行了检验的，具有低能见度。百分比是一种方便和有用的方法，用于筛选大米的变化，具有高种子稳定率。种子床的能见度较高，是指在不同的情况下，每个单位的螺旋根长度的频率较高，其中有更高的稳定性。

Field experiments were carried Out to clarify the differences and key factors in the rate of seedling establishment among rice varieties sown on the soil surface in flooded paddy fields. There is a significant difference among varieties. The main causes for lower seedling establishment rate existed in floating and seedling mortality in the younger stage. These two causes were independent of each other. No clear correlation were found between the percentage of floating seedling and the plant length, the seminal root length or the apparent weight of seedling in water, which has been reported to be the cause of floating seedlings resulting in poor seedling establishment. Root tip rotation was analyzed for indoor-grown seedlings using spectrum analysis: the maximum entropy method (MEM) was used. MEM spectrum analysis clarified that maximum power density detected in the frequency range above 0.1 cycles mmィイD1-1ィエD1 was highly and positively correlated to seedling establishment percentage in the field experiment. From the result, root tip rotation with a larger spiral angle was suggested to play an important role in the establishment of rice seedlings on flooded and very soft soil. The percentage of the seedlings with a spiral root growth with a larger angle was examined on a medium with low viscosity (10-20cp) by using 76 varieties obtained from IRRI Core Collection. The percentage is a convenient and useful method for screening rice varieties with high seedling establishment rate. The higher the viscosity of seedbed is, the higher the frequency of spiral per unit root length in the case of varieties which have a higher ability for establishment.