2) soil conformation
土壤形态
1.
By investigating some selected spots, this essay analyses the soil environment and soil conformation and discusses the soil features.
通过选点调查 ,分析土壤环境和土壤形态 ,探讨土壤特性 ,为合理开发利用土壤资源提供依据。
3) Soil nitrate nitrogen
土壤硝态氮
1.
According designing 6 N rates(0,150,300,600,900,1200 kg/hm2),this paper studied the moving dynamic status of soil nitrate nitrogen(NO3——N) in summer maize field,and discusses the economical and environmental N rates and its theories.
通过设计不同纯氮(N)施入水平(分别为0、150、300、600、900和1200 kg/hm2共6个处理),重点研究了北方褐土区夏玉米大田土壤硝态氮(NO3--N)运移动态,并讨论了夏玉米N肥的经济环保施用量及其相关机制。
2.
Authors researched the method of soil nitrate nitrogen content determination with diffuse reflectance spectroscopy for its rapidness and accuracy.
该文研究了充分利用土壤漫反射光谱在可见-近红外波段的有效信息,研究快速准确检测土壤硝态氮含量的新方法。
3.
, greenhouse vine intensive planting base, vegetable intensive planting base, and general planting farmland, were selected as research objects and dynamic changes of soil nitrate nitrogen content under different planting patterns were studied by the experimental method of field sampling analysis.
结果表明,葡萄种植基地0—100cm各土层硝态氮含量随时间的变化波动较大,而蔬菜种植基地和常规种植农田的表层土壤硝态氮含量变化幅度大于深层土壤;3种典型种植区的土壤硝态氮含量均呈现随着土层深度的增加而逐渐减小的趋势,其中土壤硝态氮含量最大值出现在葡萄种植基地的20—40cm土层中;葡萄种植基地各土层硝态氮平均累积量均高于蔬菜种植基地和常规种植农田,大棚葡萄集约化种植基地0—100cm土层硝态氮平均累积总量高达400。
4) Soil Nitrate
土壤硝态氮
1.
Effects of nitrogen fertilizer rate and ratio of base and topdressing on yield of wheat,content of soil nitrate and nitrogen balance;
施氮量及底追比例对小麦产量、土壤硝态氮含量和氮平衡的影响
2.
Relationship between soil nitrate,nitrogen balance and utilization in rainfed land
旱地土壤硝态氮与氮素平衡、氮肥利用的关系
5) soil nitrate-N
土壤硝态氮
1.
Effects of nitrogen rate on nitrogen fertilizer use of winter wheat and content of soil nitrate-N under different fertility condition;
不同土壤肥力条件下施氮量对小麦氮肥利用和土壤硝态氮含量的影响
6) Nitrate-N
土壤硝态氮
1.
Influence of Nitrate-N Space Time Differentiation to Ch. Cabbage Nitrate Content in Black Soil;
黑土土壤硝态氮时空变异对蔬菜硝酸盐含量的影响
补充资料：土壤氮素形态
土壤氮素形态
forms of soil nitrogen
这一比率在90%左右，随着土层深度的加深，比率迅速降低.土城中一部分有机态氮与无机态氮之间主要通过矿化一生物固持作用而相互变化. (朱岁匕良茶贵信)土族氮素形态(forms of 5011 ni‘rogen)土坡中含氮物质的化学结合形式和存在状态，分有机态氮和无机态氮两大类。有机态氮为与碳结合的含氮物质.无机态氮为未与碳结合的含氮物质.有机态氮占土城全氮的比率，主要决定于有机态氮与无机态氮中的粘土矿物固定态按态氮的相对含t，在表层土坡中，
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条