| 1. | Effects of tillage practices on temporal variations of soil surface properties
夏玉米耕作方式对耕层土壤特性时间变异性的影响 |
| 2. | Two - dimensional numerical simulation of soil water infiltration under bed - irrigating sowing
坐水播种时耕层土壤水分入渗的二维数值模拟 |
| 3. | Studies on the effect of iron oxide and om on organo - mineral complexes in soils
不同开垦年限黑土耕层有机无机复合体变化及有机碳组分分布特征 |
| 4. | Besides , the two systems were significantly different in soil nutrient content and soil physical and chemical properties
而且两者耕层土壤的养分含量和理化性质等指标也有明显差异。 |
| 5. | A field representative to the high production - region in yutian county , hebei province was selected and a 70 kg top layer soil sample was taken from the field in june , 1991
在河北省玉田县高产地区选一个有代表性的地块， 1991年6月麦收后采集70公斤的耕层土样。 |
| 6. | The recommended water ( by balance method ) and nitrogen ( by kns system ) practices were compared with conventional practices on spinach growth in field experiment
摘要针对传统水肥方式中存在的投入过量问题，采用控制耕层土壤湿度以及应用kns氮素推荐系统对菠菜的产量及水氮利用进行了研究。 |
| 7. | 3 ) the moisture changing processes at various location of a slope purple soil are obvious different : at up - location , soil moisture reduce more rapidly , therefore , drought will easily response to it at which the principle of often and little irrigation should be adopted
3 ）同一块紫色土坡耕地内，土壤水分的时空变化有较明显的差异。地块上部，耕层土壤含水量递减较快，因此，表现出较易受旱的情况，应采取少量多次的灌溉原则。 |
| 8. | The results show that the interface between the cultivated layer and the plough sole in the soil profile was undulated under the current cropping system mainly using small - sized four - wheeled tractors and flat under the cropping system of deep plowing annually in the fall
结果发现，现行的以小四轮拖拉机为主要动力的耕作制度下，土壤剖面中耕层与犁底层的界面为“波浪型” ，而年年进行秋翻的玉米田，其耕层与梨底层的界面为“平面型” 。 |
| 9. | Corn yields of phaeozem in " flat type " " boundary soil ( depth < 15cm ) reached 6 . 65t / hm2 . in addition to , content of available , water , organic carbon . cation exchange capacity and available n was the most in " flat type " boundary soil ( depth = 30cm )
在吉林玉米带黑土土壤物理环境方面，两种不同形状界面构造土壤在三相组成、有效土壤量、持水性能等方面差异显著，相关分析表明，吉林玉米带黑土玉米产量与耕层厚度、有效水含量呈明显相关关系。 |
| 10. | The results show that the physical and chemical conditions of the corn belt phaeozem have significant different in different profile morphological characteristics . in another way , soil composition of three phases , content of available water , nutrient content and composition of humus have significant different in different profile morphological characteristics . among three groups of profile morphological characteristics , corn yields of phaeozem in " flat type " boundary soil ( depth = 30cm ) were the most , reached 8 . 22t / hm2on average . corn yields of phaeozem in " wave type " boundary soil ( depth = 15cm ) reached 7 . 55t / hm2 on average
这两种界面构造对玉米产量影响差异显著， “平面型”界面土壤抗逆性较强，产量最高，平均产量达8 . 23t / hm ~ 2 ，而“波浪型”界面土壤抗逆性较差，它可以分为两种情况：当耕层厚度15cm时，产量处于中等水平，平均产量为7 . 55t / hm ~ 2 ；当耕层厚度15cm时，产量最低，平均产量为6 . 65t / hm ~ 2 ，此种土壤处于丘陵漫岗区，产量受水土流失影响较大。 |
