轮作

The results indicated that the transfer and loss of N and P vary with means of rotation, types of crops and the amount of fertilizer application. Buffering forest belts betweens farmlands and ditches can effectively stop and purify such elements as N and P in soil runoffs, thus controlling non-point source pollution of agricultural lands.

结果表明：农田生态系统中 N、P等迁移、淋失状况随轮作方式、作物种类及施肥状况而变化；农田与沟渠间的缓冲林带具有截留和净化土壤径流中的N、P等物质的作用，从而在一定程度上控制农业非点源污染。

The CO2 effluxes from the soil showed exponential responses to the air temperature with significant correlative coefficient (from 0.84~0.87 under different straw management, irrigation and nitrogen application strategies).

为探讨不同农作措施条件下的农田碳平衡规律，研究农田对大气CO_2的源汇特征，2000年至2003年用钠石灰碱吸收法连续测定不同秸秆还田、灌溉和氮肥施用等农作措施下京郊冬小麦—夏玉米轮作体系作物生长季的土壤呼吸。

The influence of long-term application of fertilizers and tillage under conditions of 12-year rice-based cropping system on soil nitrogen fertility was studied on Taihu region of the south Jiangsu Province. The results showed that total N content in the soil layer of 0～5 cm reached 2.89% in the long-term fallowed soil. The treatment of fallow in combination with plowing every crop season reduced total N content to 2%, occupying 70%of the M value.

通过十二年的耕作和施肥长期定位试验研究表明，苏南太湖稻麦轮作地区，长期休闲的农田0～5cm土层最高含氮量可达2.89%，休闲田结合每季耕翻，全氮含量下降，只及最高含氮量的70%，保持在2%左右。

This paper discussed effects from factors, such as temperature, water, land reclamation, fallowing, tillage, rotation, straw retention, and fertilizer management, in order to rationalize land use and management.

本文分析了温度、水分、土地开垦、休闲和撩荒、耕翻、轮作、秸秆还田、肥料管理等对土壤有机碳的影响。

Our study suggests that in order to achieve high crop yields, the long-term P input-output balance, soil P supplying capacity, and yield targets should be considered when making P fertilizer recommendations and developing strategies for intensively managed wheat-maize cropping systems.

我们的研究结果表明在小麦-玉米轮作系统中为获得更高的作物产量，当做磷肥推荐和制定措施时，应充分考虑作物目标产量、磷肥效率、长期土壤磷平衡以及土壤有效磷临界值。

Are among the obstructive factors of gleyed paddy soil, and rice-xerophyte rotation is one of the efficient measures for its improvement.

潜育化水稻土存在渍、冷、烂、闭、毒及缺素等障碍因素，采取水旱轮作是改良利用潜育化水稻土极其重要的措施。

It must be said in favour of leys that they give much more flexibility in grass land management.

必须充分肯定轮作草场在管理方面有较大的灵活性。

In a sense, output from leys in the form of milk and meat is a by-product of tillage farming.

在某种意义上，轮作草场所生产的奶和肉只是种植业的副产品。

It is impracticable to go for early bite from longer leys.

利用长期轮作草场进行早期放牧是不切实际的。

In a survey of 182 farms in 1987 in Victoria, Clark found that highest average wheat yields were obtained following lupines, canola and clover. As shown in Table 6, these rotations also led to the highest gross margins, which were about 50% higher than those obtained following wheat and oats.

1987年在维多利亚州182个农场的一项调查中， Clark发现，在羽扇豆、油菜籽和三叶草后种植小麦的平均产量最高，表6说明这些轮作方式还可以得到最高的毛边际收益，比接小麦或燕麦茬约高50%。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。