利用根盒培养和田间栽培方法，研究了黑土和黑钙土玉米根际有机磷的亏缺和积累的状况。
Rhizo-box and field cultivation methods were used to study the delpletion and accumulation of organic P in maize rhizosphere on blackland and chernozem.
通过土柱试验，研究玉米和大豆根茬还田对黑土、黑钙土各类水解酶活性的影响。
This paper studied the effects of corn and soybean stubble on soil hydrolases.
本文对黑钙土、黑土中各种作物根茬留茬与否对土壤腐殖质、土壤重组有机质的组成、结合形态及某些光学性质进行了测定。
There are few studies on the effect of crop root systems on the composition, particularly on the heavy fraction of soil humus.
按广义的黑土，包括黑土和黑钙土，应当是四大片，除上述三大片之外，另有乌克兰和俄罗斯。
If including the chernozems, there are four large part area, except the three as mentioned above, and the other is the great plain of Ukraine and Russia.
按广义的黑土，包括黑土和黑钙土，应当是四大片，除上述三大片之外，另有乌克兰和俄罗斯。
If including the chernozems, there are four large part area, except the three as mentioned above, and the other is the great plain of Ukraine and Russia.
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