Much forest harvesting resulted in the diversification of region climate and consequently brought in the diversification of crop yield 森林的过量采伐导致区域气候变化，进而引起粮食产量的变化。
Future strategy for crop yield improvements can only be devised effectively when this phenomenon is carefully and analytically studied 只有仔细地分析研究了这一现象后才能制订将来的作物增产战略。
Crop rotation plus fertilizer application produces the highest crop yields and maintains the highest soil n and organic matter levels 作物轮作加施肥产生最高作物产量，并保持最高土壤氮和有机质水平。
Ex perimental results also indicated that sprinkler uniformity had little effect on crop yield for the studied range of cu 试验结果还表明，在所研究的喷灌均匀系数范围内，均匀系数对产量的影响不明显。
Another control option might be the use of a herbicide early in the growing season to remove the weeds before competition reduces crop yield 另一种除草方法是在作物生长初期施用除草剂，不使杂草和作物竞争造成减产。
A study the uk carried out with scientists here in china , for example , suggests that chinese crop yields could fall by more than 30 per cent 例如，由英国进行中国科学家参与的一项研究表明中国的农作物将因此减少30 。
Among these abiotic stresses , water deficit is the most severe environmental factor responsible for the reduction of crop yield in many parts of the world 其中，水分胁迫是造成全世界作物产量降低的最重要的环境因素。
When presenting the relationship between fertilizer use and crop yield , it is important that all the variables important in the relationship be understood 在研究肥料用量与作物产量之间的关系时，有必要明确有关的重要变量。
The result of experiments also showed the influence of the factors and their interaction to crop yield and economics under the experimental conditions 试验结果还表明，在试验条件下各因素及其交互作用对作物产量和经济效益的影响。
The study of plant nutrition and growth as related to soil condition , especially to determine ways to increase crop yield 农业生物学；土壤生物学关于植物养分和与土壤条件相关的生长的研究，尤其是对判定如何增加农作物产量方法的研究
