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The effect of root cutting and potassium application at topping on yield and quality of flue-cured tobacco was studied with different nitrogen application rates in the field.

通过田间试验研究了不同施氮量条件下打顶时断根并追钾对烟叶产质量的影响。

Alfalfa ; seed yield ; irrigation ; density ; cutting root crown ; growth and development

苜蓿；种子生产；灌水；密度；切根；生长发育

Yield reduction by root cutting was higher in larger panicle variety than in smaller panicle variety, and higher at panicle initiation than at flowering stage.

切根对大穗型品种籽粒产量的影响大於对小穗型品种的影响；在穗分化期切根的影响大於开花期。

Weedy rice is one of the most notorious weeds found in rice-planting areas all over the world. It commonly causes reduction of rice yield and affects grain quality.

杂草稻是广泛分布在世界各地稻田中的一种恶性杂草，能降低水稻的产量和质量。

In the early period of rice-growing, the yield was very low due to the heavy salt and poor fertility of the wastelands.

在水稻种植早期阶段产量很低，因为这种荒地盐分太重、土壤肥力太低。

Italian rice fields can be used to send rice species, grass symbiosis 7 - 10 days to get early seeding season, before winter to gain a higher fresh yield, so that livestock farms before and after the Spring Festival market, access to better economic benefits.

稻田寄种黑麦草可以利用稻、草共生7--10天的时间抢季节早播，争得冬前较高的鲜草产量，使养殖的禽畜春节前后上市，获得较好的经济效益。

The convection-dispersion equation with the retardation coefficient yield by method has been adopted to model NH4--N transport in saturated soil, simulation results are compared well with experimental results.

基于批平衡得到NH_4~+—N的吸附延迟系数，利用对流一弥散方程模拟NH_4~+—N在饱和土壤中的迁移过程，模拟结果与试验结果吻合较好。

Fe was favorable for the hydrogen-producing fermentation system to keep a lower redox potential and this would improve its hydrogen yield due to the enhancement of the metabolic activity of anaerobic bacteria.

单质Fe具有较强的还原能力，可使系统的氧化还原电位维持在较低的水平，对于提高厌氧细菌的代谢活性，提高反应系统的产氢能力，具有较好的促进作用。

This design is in the light of the principle of the high yield, high quantity of pelletizing and stable operation.

此次设计本着高产量、高质量成球，稳定运转的原则，实现了现代预加水盘式成球的节能、经济、环保、可扩展的目的。

Junk bond:A corporate bond having a high yield and high risk.

后保债券，价格低但风险大的债券

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48