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1·Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.

更好的灌溉可以显著提高作物产量；目前，全球约40%的粮食供应都来自于灌溉地。

2·In the early 1940s, basking in the glory of chemical-based intensive agriculture, the farmers avidly took to pesticides as a sure measure to boost crop yield.

在20世纪40年代早期，农民们沐浴在以化学品为基础的集约农业的光辉下，贪心地把杀虫剂当作增加作物产量的一种可靠方法。

3·Climatic analysis of the crop yield.

作物产量的气候分析。

4·Photosynthesis is the basis of crop yield.

光合作用是作物产量形成的基础。

5·Crop yield correlates closely with annual rainfall.

农作物的收成与年降雨量有密切关系。

6·Crop identification is the basic work in crop yield estimation.

作物识别是遥感作物估产的基础。

7·Ways of improving crop yield per unit area and the countermeasures.

提高作物单产的途径与对策。

8·The crop yield increases with the thickness of covered soil increasing.

作物产量也随复土厚度增加相应增加。

9·An operational method of crop yield disaster losses evaluation is introduced.

介绍了农作物产量灾害损失评估业务化方法。

10·How to break crop yield stagnation is a serious question warranting an explanation.

如何打破作物产量徘徊的局面是应找到答案的一个严重问题。