| 1. | Effect of different plastic film mulching patterns on yield of spring potato
广州地区冬种马铃薯覆盖栽培试验 |
| 2. | Calculation models of rice evapotranspiration in plastic film mulched dryland
覆膜旱作水稻蒸发蒸腾量计算模型研究 |
| 3. | Computerized simulation of working process of seed metering device for 2bqm - 2 plastic film mulch pneumatic precision planter
气吸式膜上精量播种装置排种过程的仿真研究 |
| 4. | Effects of plastic film mulching on temperature increase and preservation of soil moisture and its responses to growth character of rice with dry - land cultivation
水稻旱作覆膜的增温保墒效果及其对生育性状影响研究 |
| 5. | The conclusions were as follows : 1 . the farming practice of clear plastic film mulch produced significantly the effects on soil physical , chemical and biological properties
本项研究取得如下主要结论： 1田间条件下，地膜覆盖可导致土壤水分、温度、硝态氮含量及土壤nr活性发生显著变化。 |
| 6. | The results showed that the soil moisture was moderate for the tree growth by plastic film mulching and covering grass under trees , which had led to higher yield and quality of the fruit than that of other treatments
因此，在黄河故道区无公害酥梨生产中，建议采取塑料薄膜覆盖和树盘覆草方法，此方法操作简单，便于实施。 |
| 7. | The testing result shows that there is a difference actual seed dropping angle and the one acquired by calculation , therefore , a formula for the calculation of seed dropping angle even closely suited to production practice has been driven out and a theoretical basis for the application of 2bqm - 2 model plastic film mulch pneumatic precision planter in practical production is advanced in this paper
通过试验，找出种子的落种位置规律。通过试验结果分析，找出种子的实际的落种角度和计算的落种角度之间的差别，推导出更适合实际生产中所需要的落种角度，为2bqm - 2型气吸式精量铺膜播种机在实际生产中的应用提供了一定的理论基础。 |
| 8. | To overcome the restriction of water and heat on agricultural production in northwestern arid and semiarid region , the farming practice of clear plastic film mulch was spread due to its capacity of retaining water and temperature in the winter wheat field in many areas , howeve r soil properties had also were affected significantly in the meantime
在西北干旱半干旱地区，为了克服水热资源对农业生产的限制，地膜覆盖的农作措施以其显著的增温保墒作用在冬小麦农田得到了大面积的推广和应用；与此同时，该农作措施下的土壤性质也发生了深刻的变化。 |
| 9. | The experiment was conducted to determine the influence of different regulation and control methods of soil moisture , such as plastic film mulching , covering grass under trees , growing grass under trees , irrigating regularly , loosening the soil under trees , on quality of fruit in a non - public nuisance crisp pear garden in the area of old course of yellow river
摘要以45年生酥梨树为试材，分析测定塑料薄膜覆盖、树盘覆草、自然生草、定期灌水、清耕等不同土壤水分管理措施对土壤水分和酥梨品质的影响，结果表明：塑料薄膜覆盖和树盘覆草处理中，土壤含水率比较适宜，且变幅较小，有利于果实生长发育和提早着色，提早成熟，产量和品质较好；其它处理中土壤含水率要么过高，要么过低，且变幅较大，酥梨的果实品质也比较差。 |
| 10. | In order to overcome the disadvantage of 2bps - 2 plastic film mulch seeder with watering apparatus that the operation speed is limited and the moisture evaporation loss is great , according to the theoretic analysis of water movement in soil , this paper offers another watering project - hidden watering under film , designs three different types of watering devices , meanwhile conducts test research with different watering devices in different position the change of the soil moisture content
本课题针对2bps - 2型坐水铺膜播种机坐水后，土壤水分蒸发损失大和机组作业速度低的突出问题，通过对水在土壤中运动的理论分析，提出了在行间膜下的暗道式施水方案，围绕此方案设计了三种坐水部件，并就不同坐水部件在不同施水位置施水后，种子带土壤含水量的变化进行了试验研究。 |
