只有作物：是否有覆盖作物？
有机物施加于任何土壤都是很宝贵的，不管施加的是厩肥、覆盖作物或是改土作物。
Organic matter is invaluable as an addition to any soil whether applied as manure as a cover crop or as a soil-improving crop.
同时，在相同环境条件下对有作物覆盖的土壤床和无作物覆盖的土壤床中的水热分布也进行了模拟比较。
The simulation is also made to describe the heat and mass distribution under the same environmental conditions between vegetation soil-bed and bare soil-bed.
采用FAO推荐的双作物系数法计算了秸秆覆盖条件下夏玉米的作物系数。
Based on the analysis of field experimental data, crop water requirement and crop coefficient of straw-mulched summer maize are evaluated with dual coefficient approach recommended by FAO.
通过田间定位试验，研究了水泥硬壳覆盖对盐渍化土壤蒸发、作物蒸腾、土壤盐分变化、作物生长发育状况、产量及水分利用效率的影响。
The effects of concret mulching on evaporation, transpiration, evapotranspiration, soil salt, yields of cotton and corn, water use efficiency were studied by field experiments.
秸秆覆盖能抑制土壤蒸发，增强作物蒸腾，从而提高作物水分利用效率，在旱地推广合理施肥和秸秆覆盖技术是提高作物产量的有效途径。
Mulch straw could increase WUE by reducing soil evaporation and increasing crop transpiration. The yield could be increased by using the technique of rational fertilizer a...
秸秆覆盖能抑制土壤蒸发，增强作物蒸腾，从而提高作物水分利用效率，在旱地推广合理施肥和秸秆覆盖技术是提高作物产量的有效途径。
Mulch straw could increase WUE by reducing soil evaporation and increasing crop transpiration. The yield could be increased by using the technique of rational fertilizer a...
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