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Alternate bearing is when a tree produces a heavy crop one year, called an "on-crop," followed by an "off-crop" the next year.

隔年结果指的是,前一年果树结出大量果实,叫做"结果",而后面一年却"疏果"。

Partitioning the detail vegetation types, in the agricultural vegetation, annual harvest crop had a strongest sensitivity to precipitation, the follow was temperature and evaporation. Biannual harvest crop part of which could be irrigated or biyearly tri-harvest dry crop had a strongest sensitivity to temperature, the follow was precipitation and evaporation.

具体分植被类型来讲,农业植被中:一年一熟粮作植被对水分的敏感性最强,温度、蒸发次之;大部分具备灌溉条件的一年两熟或者两年三熟旱作农业植被,也对温度最敏感,对降水、蒸发的敏感性要弱一些;一年水旱两熟粮作植被对温度最敏感,蒸发、降水次之。

The selection of N-catch crop and the capacity of nitrate extraction from deep soil layer by catch crop were reviewed in the paper. It also pointed out that combining with N-catch crop in the rotation system had been regarded as a good approach for safe vegetable production.

过量施用的氮肥在自然降水或灌溉水的作用下,可通过径流损失造成地表水水体的富营养化;部分土壤中的NO-3 N可随水向下迁移污染地下水,在地下水环境中仍主要以硝态氮形式

This college was founded by merge of college of crop, plant protection and gardening, and its disciplines cover crop science, plant protection, and gardening, of which crop genetic breeding, crop nursing and farming, pathology of plant, agricultural entomology and pest prevention and cure, pomology science was national key disciplines.

该学院由原作物学院、植保学院和园艺学院三个学院合并建立,学科覆盖作物学、植物保护学、园艺学三个一级学科,其中作物遗传育种学、作物栽培学与耕作学、植物病理学、农业昆虫与害虫防治学、果树学为国家重点学科该网站介绍了给学院的专业设置、师资力量和科研工作等信息。

Cover crop using Mucuna munaneae as the third crop in the cropping system; zero tillage using herbicide or hand pulling for weed control; mucuna foliage and crop residues are used for mulch.

在种植制度中,用黎豆属作物作为第三季覆盖作物。用除草剂或人工除草实施免耕,把黎豆属作物叶片和其它作物残体,作为覆盖物。

The results showed that the inhibitory effects of chemical deicers on the germination of crop seeds were obvious increasing trends with the increase of their concentrations.There was a distinct difference to the same crop species for the different types of deicers,whereas there was a distinct difference to the same deicer for the different crop seeds.

结果表明:随着融雪剂处理浓度的增加,其对农作物种子发芽的抑制效应呈显著上升趋势,且不同融雪剂品种对同种农作物品种发芽的影响呈现较为明显的差异,不同农作物种子对同种融雪剂的反应差异也较大。

Planting system of grain oil-bearing and fresh crop, planting index, per unit area yield, gross output, planting way and crop rotation system of the whole Tibet in different period, as well as the planting situations of agricultural districts of river valley such as Lhasa, Lhoka, Shikaze,etc. were analyzed. The main agricultural district of Tibet at present were summarized:(1) Crop composition and distribution is unreasonable;(2) The intensive cropping development is slow;(3) The planting mode is single.

通过分析全区不同时期种植指数,粮、经、饲作物结构,单产,总产,种植方式和轮作体制,以及拉萨、山南、日喀则等河谷农区的种植情况,概括和总结出目前西藏主要农区:(1)作物布局不尽合理;(2)多熟种植制的发展缓慢;(3)种植体制模式单一。

The updated WASDE incorporates the recently released September 1 grain stocks estimates for the 2007-08 crop year end, the 2008 US small grain crop annual production summary estimates, ongoing world crop and trade results, as well as today's updated US row crop estimates.

测。更新后的全球农业供需预测包含了近期公布的2007-2008作物年度截止9月1日的谷物库存预测、2008年美国小粒谷物年产量汇总预测、全球作物产量及交易现状以及今天的更新后美国行播作物收成预测。

The thesis is based on income question, forest coverage rate and grop production.to beging with, date envelopment analysis is proved that it can be applicated into grain for green in shan-bei district, and then in view of the fact, seven esential factors which have influence on the project are found out: expense of dam, expense of crop,expense of cash tree ,expense of defense tree,other economic crop,expense of grass and graziery;and the output factors include:income of gdp,pure income per captia,the area of decreasing land loss,graziery income ,crop production,income of tree,the totle income of economic crop.after the date of each facts are puted into dea model,unefficiencial decision making units found.the data that are got through adjusting unefficiencial dmus dy dea can offer guide in shanbei district upgrading of an industrial structure.at the same time ,taking into account some possible problems in or after grain for green in shan-bei district,the thesis bring out some propesal to improve the circumstance,enhance the life level and putthe relation of population,resource and circumstance into a healthy orbit.

论文以解决陕北地区的收入问题,植被问题以及粮食产量问题为出发点,首先从理论上分析了包络分析方法在陕北地区退耕还林中运用的可行性,然后结合陕北地区目前的实际情况,综合分析出影响陕北地区退耕还林的关键的七个因素作为输入指标:水利水保设施投入,农作物投入,经济林种支出,防护林支出,其它经济作物,草类支出,畜牧业投入;以退耕还林所要解决的最终问题作为输出指标:GDP收入、农民人均纯收入、水土流失减少量、牧业总产值、粮食产量、林业总产值、其他经济作物总产值。将各指标所对应的数据代入模型后,通过分析求解得出非有效的决策单元,再运用包络分析方法的一些基本原理对非有效的决策单元进行调整,由此所得的数据对陕北地区的实际投入具有很好的指导意义。同时,又针对陕北地区在退耕还林过程中以及之后可能面临的困境,提出了一些建议和对策。最终使得陕北地区的投资环境尽快得以改善,使农民尽快脱贫致富,使人口、资源、环境的关系尽快纳入良性循环的轨道上。

Investigation and evaluation of soil and water resources in Minqin Oasis indicate that the proportion of grain crop, cash crop and grass is 36.94:45.16:17.90 for 2005. And a comparison with that for 1991 indicates that land use structure is developing towards rational proportion of grain crop, cash crop and grass; and harmony among agriculture, stockbreeding and forest. The main limiting factors of land resources are water, soil quality, salinity and fertility, and there is about 3.9218×10^8 m^3 water deficit per year in Minqin Oasis.

通过水土资源现状的分析评价,发现2005年民勤绿洲粮经草比例为36.94:45.16:17.90,与1991年相比,土地利用格局正向粮经草比例优化和农林牧协调方向发展;民勤绿洲土地资源的限制性因素主要为水分、土质、盐碱和肥力;对水资源现状分析发现民勤绿洲年缺水量达3.9218亿立方公尺。

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