缺氮的

In this paper,the geographical distribution,profile shape and char- acteristics of major soil types such as the young brown earth,brown earth and meadow brown earth in the eastern low-mountain and hilly region and the meadow soil,saline meadow soil and paddy soil in the western plain region in Haicheng county of Liaoning Province are diseribed;the primary physico-chemical properties,organic matter,total nitrogen,total phosphorus,total potassium,total exchange of positive ions,the content of.01 physical cl...

本文叙述了海城县东部低山丘陵区的棕壤性土、棕壤、潮棕壤和西部平原区的草甸土、盐化草甸土及水稻土等主要土壤类型的地理分布、特性、剖面性态；论述了这些土壤类型的主要理化性质，有机质、全氮、全硷、全钾、阳离子代换量、。01物理性粘粒含量等及微量元素的含量、丰缺程度。根据主要土壤类型的性质和特点，作者提出了棕壤、草甸土两大土类的合理利用意见及其改良措施。

In the South of Hunan with cigarette-rice multiple cropping, the pH is medium and high, the organic matter is high, but the humus content is low in the organic matter; N and Zn are abundant, P is very scarce, about 60% of soils is lack of B seriously.

以年内烟－稻复种连作为主的湘南烟区，土壤pH偏高，有机质含量高，但有机质中腐殖质的比例较低；土壤中的氮和锌比较丰富，钾很缺乏，有近60％的土壤严重缺硼。

"In practice the missing element will be either nitrogen, phosphorus , or potassium, but superabundance of any two of these will not make up for the lack of the third."

实际上，所缺的元素不是氮，就是磷，再不然就是钾。三种养分中，即便是两种丰富有余，也不能弥补第三种的不足。

Based on the facts of low soil fertility and unbalanced nutrient ratio in Ankou valley ,one soil sample was collected per 2 to 3 hm 2 according to the land use pattern and the relief determinant .

针对安口流域内土壤肥力水平低且养分比例失调的实际状况，按土地利用方式及地形部位每 2～ 3hm2 面积采集一个土壤样品，用常规分析方法测定了土壤有机质、有效氮、有效磷、有效钾、有效铜、有效锌等养分指标，编制了土壤养分丰缺对照表，对各测定项目进行了系统评价，并作了相应的推荐施肥建

The content of soil ulmin,and the entire nitrogen have slightly rise; compares to 20 years ago , the average content of soil effective phosphorus has slightly increased,but the condition that the soil lack of the phosphorus is still obviously;Athough the content of fast-acting potassium has slightly down,it still stand in a low level,so the soil can't satisfies the needs of the plant normal live.

土壤有机质、全氮含量略有上升；土壤有效磷平均含量比20年前略增加，但缺磷状况仍十分明显；速效钾含量略有下降，仍处于较低水平，不能满足作物正常生长的需要。

All ofthese reactions were carried out under mild conditions and are new effective methodsfor the preparation of indolizine derivatives. The reaction of phthalazinium and quinoxalinium N-ylides with electron-deficientolefins in the presence of oxidants have also been studied, it has been found that activemanganese dioxide could behave as a dehydrogenating oxidant. Pyrrolo[2,1-a]phthalazines and pyrrolo[1,2-a]quinoxalines are obtained in this way.

本文还对六员二氮杂环化合物酞嗪和喹喔啉的N-叶立德在氧化剂存在下与缺电子烯烃的l，3-偶极环加成反应作了研究，发现活性二氧化锰也是一个优良的氧化剂，并分别合成得到了吡咯并[2，1-a]酞嗪和吡咯并[1，2-a]喹喔啉衍生物。

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 resulted that there was an obvious rhizosphere effect in all growing years of Caranaga microphylla plantation. The pH value of rhizosphere soil was lower than those of near rhizoshphere soil at different growing years. The content of organic matter, total N and available K in rhizosphere soil were all higher than those in near rhizoshphere soil, but the content of Olsen-P in 5-age plantation was remarkably deficient in rhizosphere soil.

对不同生长年限的小叶锦鸡儿人工灌丛根际土壤变化规律研究表明，根际土的pH均小于根外土：土壤有机质、全氮、速效钾在根际土中均有一定程度的富集现象；而5年生的小叶锦鸡儿根际土的有效磷含量出现了亏缺。

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。