| 1. | The readily available p extracted by imported resin membrane in situ was closely correlated with relative corn seed yield in the - p plots from field experiments
树脂膜室内埋置法所吸附的钾容易被0 . 5mol lhcl解吸下来。 |
| 2. | The yearly burning raised soil pll , available n and k and reduced soil organic mater , total n , total p , available p and ca
连年火烧迹地土壤ph值升高，有机质、全氮、全磷、速效磷、钙的含量均有所下降，而有效氮、有效钾的含量有所增加。 |
| 3. | Compared with alfalfa land , the soil organic matter , total k , slowly released k and available k all decreased , but total n , total p , available n and available p increased
玉米地与首稽地相比，有机质、全k 、缓效k和速效k均下降，而全n 、全p 、碱解n和速效p含量的增加。 |
| 4. | The relationships between the contents of labile p and algae - available p in the soils and the content of olsen - p or total p in the soil reached significantly or extremely significant level , respectively
Cacl _ 2浸提磷或naoh浸提磷与土壤全磷或土壤有效磷含量有显著的相关性。 |
| 5. | They concluded that the farmers ' soybean yield gap were due to low quality seed , no application of herbicide , chemical fertilizer , coupled with inadequate available p in soil and poor production technology
他们指出农民大豆产量差距是由不良种子、不使用除草剂、化肥、土壤有效磷不足和生产技术不良造成的。 |
| 6. | Organic matter and available n of topsoil decreased in recreational areas , but the soil bulk density and ph increased . affected by garbage decomposing , soil available p concentration varied obviously in recreational areas
活动区土壤有机质含量降低， ph值升高，容重增大，碱解氮含量降低，受垃圾分解影响，速效磷含量发生变化。 |
| 7. | Therefore , olsen - p , labile p and algae - available p in the soils accumulated gradually with long - term applying fertilizer p , which were favorable to the growth of crops , but enlarged the risk of p loss from soil to water bodies
随着土壤磷素水平的提高，土壤富磷化的同时，作物有效性磷、藻类可利用的磷量也相应的增加，其对环境潜在的影响也明显地提高。 |
| 8. | The contents of available p are increasing along with depth increasing . the contents of soil available k have the similar trend under different site types , that is , the contents surface layer about 0 - 40cm is higher than sub layer
刺槐林土壤全氮、有效氮含量表现出和有机质相似的变化规律，表层土的全氮、有效氮含量最高，随着土层深度的增加，土壤全氮、有效氮含量随着减小。 |
| 9. | 4 ) soil nutrient of leguminosae also higher than non - vegetation soil ; while organic matter and available k increased , there was no significant change in total n ( it increased slightly ) ; available p and soil ph decreased
4 )豆科植物较无植被覆盖地，土壤养分朝着良性循环转变。土壤有机质、速效钾含量提高，全氮含量稍有增加，速效磷含量降低， ph值有所下降；这些变化主要发生在土壤表层。 |
| 10. | Then by methods of fractionation of inorganic and organic p in soils and multivariate statistical analysis , this paper discussed phosphorus fractions in soils with three fertility levels and in different soil layers . the affecting factors on fast - available p ( avail . p ) were also related
在此基础上，用无机磷分级和有机磷分组方法、多元统计分析的方法，研究了石灰性土壤不同肥力与不同土层中磷素的各种形态含量差异以及影响速效磷的因素，结果如下： 1 |
