覆盖作物

Because the limited time period of this study, to investigate the long term effects of row space and crop density on reducing soil evaporation are necessary in the future.

由于这次研究的期间较短，对行距、多播等项目的研究尚不够深入，有必要在今后的工作中进一步探讨。同时，对哪种秸秆可以避免降低冬小麦地温的问题进行深入研究，具有重要的现实意义，如果能解决好这个问题，则不仅有利于秸秆覆盖的大面积推广，而且能达到在使作物增产的同时减少土壤蒸发的目的。

In addition, aerodynamic roughness of stubble field increased with the increasing of stubble height, until the heights reached 15, 30, 15 cm for naked oats stubble, oilseed rape stubble and wheat stubble, respectively.

同类作物不同高度的留茬覆盖下，地表空气动力学粗糙度随留茬高度的增加而增大，在莜麦、油菜和小麦茬高度达到15、30和15 cm时显著增大，是3种留茬防风的有效高度。

The results showed that a subsoiler with adjustable wings could loose the deep soil with dead interval and loose the surface soil completely.

保护性耕作要求大量的作物残茬覆盖地表，耕作量减少到能保证种子发芽即可，使用农药来控制杂草和病虫害。

A new kind of subsoiler with adjustable wines has been developed and thestructure of soil after subsoiling is also studied,it is found that thissubsoiler can loose whole surface of soil with intervally looseing the deepsoil,making a better seed bed for planting narrow row spaceing crops such aswheat.

分析了可调翼深松铲的入土性能，研究了松后土壤结构，试验发现，利用安装位置较高的可调翼深松铲，可以为小麦覆盖地创造"表层全松底层间松"的土壤结构，这种结构有利于行距较小的小麦等密植作物播深均匀，该深松方法与原理具有新意。

However comparing with the genetic map of tomato and Arabidopsis, the genetic map of Cucurbita need to be more saturated, in order to cover the whole genome.

然而，与番茄、拟南芥的图谱研究相比，目前瓜类作物的遗传图谱密度还不够饱和，不能覆盖整个基因组。

If you use plastic or other synthetic mulches, is the mulch removed at the end of the growing or harvest season

如果使用塑料或其它合成物质覆盖农田，在作物到生长末期或收获季节是否将覆盖物清除？

The study was conducted in the field to have a survey of the degradation of films and examine the effect of degradable films on crop by comparing it with the uncovered plots and polyethylene films. And the laboratory experiment on the effect of different soil moistures (air-dried, 0.10 g/g, 0.15 g/g, 0.20 g/g, 0.25 g/g, 0.30 g/g) and temperatures (5℃、 15℃、 25℃、 35℃、 45℃) on degradable ratio and content of films was studied. The conclusions were as follows:(1)The film can be degradable at every treatment but its degradation was best when the temperature and water content in soil was 35℃ and

本试验统计观察了降解膜的田间降解状况，比较了它与裸地、普通膜对作物的覆盖效果，在室内研究了在不同土壤水分(风干土、0.10g/g、0.15g/g、0.20g/g、0.25g/g、0.30g/g)和温度(5℃、15℃、25℃、35℃、45℃)下，膜降解率、土壤微生物量碳等的变化情况，获得的主要结论如下：(1)地膜在各处理下都发生降解，但温度为35℃和水分为0.25g/g时地膜降解最快，程度最深。

Wheat-straw mulching ; Saline-alkaline Soil ; Fertility ; Crop Production ; Effect

麦秸覆盖；盐渍土；肥力；作物产量；影响

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。