查询词典 nitrogen-free

The teatments of urea application rate reduced by 5%～15% and added compound nitrogen fertilizer synergists,the growth and nitrogen content of maize were not significat changed,and the total ~(15)N uptake and nitrogen uptake by maize were the same as CK_2 or increased a little.

氮素减量5%~15%时配施复合氮肥增效剂对玉米生长和含氮量影响不显著，15N和吸氮总量与不施增效剂的处理相当或有所提高。

Under the field condition,maize yield,total uptake,net uptake,physiological rate and agronomic use efficiency of nitrogen were the same as CK or increased.The apparent utilization rate of nitrogen was enhanced by 14.8%～15.2% treated with urea reduced by 5%～15%(7.8～23.7kg/hm~2) and added with compound nitrogen fertilizer synergists.

在大田条件下，尿素氮减少5%~15%(即减少施氮7.8~23.7kg/hm2)配施复合氮肥增效剂不影响玉米的单季产量，玉米植株吸氮总量、氮素净吸收量、氮肥生理效率和农学效率与不施增效剂的处理相当或增加，氮素表观利用率提高

The average level of the soil available potassium was 119.96 mg/kg, which decreased 18.94 mg/kg and 1.05 mg/kg one year averagely. But the decreasing trend alleviated in recent years. There were 39.5 kg/hm^2 nitrogen and 30.9 kg/hm^2 phosphorus (P2O5) more than needed averagely, and 150.0 kg/hm^2 potassium (K2O) in deficiency. Though the fertilizer application was high and the rate of fertilizer was 647.96 kg/hm^2 in nutrient, the ratio of organic to inorganic was still unreasonable. The ratio of the chemical fertilizer nitrogen phosphorus (P2O5) and potassium (K2O) was 1:0.42:0.14. The nitrogen application was enough and even higher than that was needed. The phosphorus was proper elementarily and potassium was in deficiency. The yield of wheat which was the main crop increased slightly and that of other autumn harvest crops was stable.

土壤速效钾7年平均值119.96 mg/kg，比第二次土壤普查时下降了18.94 mg/kg，平均每年以1.05 mg/kg的速度下降，但近年来下降趋势变缓；养分平衡中氮素平均盈余39.5 kg/hm^2，磷素(P2O5)盈余30.9 kg/hm^2，钾素(K2O)亏缺150.0 kg/hm2；全省施肥水平较高，每公顷总施肥量折纯养分647.96 kg，但有机无机比仍不合理，化肥氮、磷、钾投入比例1：0.42：0.17，氮肥充足，部分地区用量偏高，磷肥基本合理，钾肥不足；主要农作物小麦产量略有上升，其它主要秋收作物产量基本稳定。

The nitrogen combined for a time into the leaves and root was easier to export to fruit, which the strong nitrogen sink and the most competitive ability for nitrogen in the plant of sweet pepper.

氮素营养水平尽管很少影响新近固定的〓C在不同器官间的分配，但却制约着〓C在体内的运转和再分配。氮不仅制约着新近吸收的〓N在不同器官中的分配，且影响〓N的运转。

The nitrogen absorption, the utilization of nitrogen fertilizer by flue-cured tobacco, the AN values of the soil at differentapplication of nitrogen were studied with the method of 15N tracer.

作物在其生长发育过程中吸收的氮素主要来自于土壤中可利用的氮和人们所施用的氮素肥料，这二种可利用的氮素来源倍受人们关注。

Influence of different nitrogen fertilizer application levels and organic fertilizer rate and nitrogen forms and topping stages of sun-cured red tobacco on the main nitrogen compounds and the yield and quality were studied through field experiment in Fenghuang county ,the city of Hunan province.

2004-2005年，在湖南省湘西自治州凤凰县通过大田试验，初步探讨了氮用量、有机无机肥配比、氮素形态配比、打顶时期对晒红烟主要含氮化合物含量及产质效应的影响，研究结果如下： 1、施氮水平对晒红烟烟碱及其它含氮化合物的含量具有明显影响。

And lower the pod shell soluble sugar content at the beginning of seed filling stage. The effect of nitrogen was different at different growth stages.3、Effect of nitrogen levels on soybean nitrogen metabolismNitrogen can increase nitrate reductase activity, and the effect was the most obvious in the peak period.

施氮可以提高开花期叶片淀粉含量，降低茎秆中可溶性糖含量，在成熟期降低叶片可溶糖含量，并在鼓粒始期降低荚皮可溶性糖含量。3、氮素水平对大豆氮代谢酶影响施氮可以提高硝酸还原酶的活性，且在酶活性峰值期作用效果最明显。

At the same time, there were complementation of water and nitrogen between spring-sown maize and summer-sown maize in the system of relay-planting. Spring-sown maize could get water and nitrogen from the summer-sown maize zone, and also the roots of summer-sown maize could touched to the regions of spring-sown maize to get water and nitrogen.

同时，套作体系中春、夏玉米存在对氮素和水分的互补利用，春玉米根系可以伸展到夏玉米区，而夏玉米也可以吸收利用春玉米区，从而达到养分与水分的互补利用。

Relay-planted with the same spring-sown maize, the quantity of nitrogen absorption of late maturity summer-sown maize was highest, but their nitrogen use efficiency was lowest, which because most the nitrogen absorbed were left in organs except grain.

与同一春玉米品种套作时，夏玉米为晚熟品种的吸氮量均较高，但其氮利用效率却较低，所吸收的氮更多的滞留在籽粒以外的植株器官中，向籽粒中转移的较少。

Difference of nitrogen competition and utilization in relay system Relay-planted with same late maturity or early maturity spring-sown maize, the yearly nitrogen absorption quantity of summer-sown late maturity maize YD 13 was highest, those of summer-sown middle maturity maize were middle, and those of summer-sown early maturity maize were lowest. While relay-planted with middle maturity, the yearly nitrogen absorption quantity of summer-sown late maturity maize YD13 was highest, those of summer-sown early maturity maize were middle, and those of summer-sown middle maturity maize were lowest.

不同熟期春夏玉米套作氮素竞争利用及其对产量和品质的影响 2.1 套作体系氮素竞争利用差异研究结果表明，与相同晚熟、早熟春玉米套作的夏晚熟品种YD13套作模式全年吸氮量均较高，其次是中熟品种，早熟品种全年吸氮量最低；而与中熟春玉米品种套作时，仍以夏晚熟品种YD13套作模式全年吸氮量最高，其次是早熟品种，中熟品种套作模式全年吸氮量最低。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。