您要查找的是不是：
- soil N availability 土壤N有效性
- These data demonstrate that magnitude of nodulation response to N may differ between species but despite these differences, legumes will reduce BNF when N availability increases. 这些数据还表明，结瘤对氮反应的程度在不同种间而有不同。但尽管存在这些差异，在氮水平增加时豆类作物均将减少生物固氮。
- Nitrogen accumulation by non-nodulated soybean (Table 3) measures the amount of mineral N available in the soil. 不结瘤大豆积累的氮素（表3）可以测算出土壤中有效矿质氮的总量。
- The result (pot)showed that soil N,P,Fe,Cu,Zn,Mn content were higher in treatment added moss,soil K,Ca content were lower. 盆栽试验结果表明:加入苔鲜的处理，土壤中的N、p、Mg、Fe、Cu、zn、Mn含量较高，而K和ea的含量较低:加入草炭的处理，N、p、Mg、Mn的含量较高，而K、Ca、Fe、Cu、zn的含量较低。
- Singleton and Tavares unpubished data. * N available from the soil setimated by N uptake by ineffectively nodulated plants (strain SM-5). Singleton和Tavares未发表数据。* 来自土壤的有效氮通过非有效结瘤菌株(SM-5)对N的吸收来估算。
- N mineralization, extractable mineral N or the use of a non-fixing legume or grass to measure available N supply are useful tools to account for the soil N variable. 氮矿化、可浸提的矿质氮以及利用不固氮的豆类植物或禾本科来测量氮供应均是解释土壤N变量的有用手段。
- Results showed that the amount of soil N mineralized and supplied to plant in the soil derived from red sandstone was higher than in that derived from Quaternary red clay. 结果表明 :红砂岩发育红壤 (红砂土 )的矿化量和供氮量显著高于第四纪红黏土 (红黏土 ) ,同一母质中轻度侵蚀红壤的矿化量和供氮量又显著高于重度侵蚀红壤。
- In the field experiment, the characteristics of nitr ogen and phosphorus absorption of winter wheat, the dynamic changes of available soil N and P and their relation were studied. 通过田间试验,研究了冬小麦氮、磷营养特征、土壤养分的动态变化及二者的关系。
- The dynamic changes of soil urease and phosphatase activities and soil N,P and K in cherry rhizosphere and their relationships were studied by a pot experiment. 通过盆栽试验研究了樱桃根际脲酶、磷酸酶活性与氮、磷、钾动态变化及其相互关系。
- Soil pH was significantly lowest in CE.Temporal patterns of soil N mineralization and nitrification were significant related to the growth of conifers (i.e. 土壤氮矿化和硝化的时间格局与针叶树的迁移显著相关并且随着凋落物，森林地表，细根和土壤特性的演替而变化。
- Generally, increasing mineral N available to legumes reduces N derived from BNF without enhancing yield appreciably. 一般来，说对豆类作物增加矿质氮的提供会减少生物固氮量而并不能明显提高产量。
- To ensure N available from BNF does not limit legume yield, many farmers inoculate their crops with rhizobia. 为确保来自生物固氮的有效氮不限制豆科作物的产量，许多农民用根瘤菌接种他们的作物。
- Some reports indicate reduction of legume BNF by mineral N is dependent on host species and form of N available. 一些报告还指出，通过矿质氮引起的豆类作物生物固氮的减少与寄主品种和有效氮的形态有关。
- Some plants push their roots deep into the soil. 一些植物的根深深长入土中。
- Such crops won't grow in limy soil. 这类作物不能在石灰质的土壤中生长。
- What shall we grow in this alkaline soil? 我们应该在碱性土壤里种什么？
- There are a lot of worms in the soil. 泥土中有许多蠕虫。
- Water has permeated (through) the soil. 水已渗遍那片土壤。
- Influence of Black Soil N,P,K on maize yield and its control0l 黑土农田氮磷钾对玉米产量的影响及调控
- There are some clods of soil on the mat. 垫子上有些土块。
