农业土壤的

Soil moisture sensors based on principles of Time Domain Reflectometry,Frequency Domain and a new type of soil moisture sensor based on Standing Wave Ratio developed by China Agricultural University were evaluated with typical sandy loam,loess,peaty sand and leady loam from northern Germany.

该文针对时域反射法、频率分解法型土壤水分传感器和中国农业大学研制的基于驻波率原理的新型土壤水分传感器，在德国北部典型的沙壤土、黄土、含煤沙土及含铅壤土土样上做了试验。

Soil moisture is an important factor in research fields of hydrology,meteorology,pedology,ecology,agricultural science and so on.

土壤水分是水文学、气象学、土壤学、生态学以及农业科学等研究领域中的一个重要的参数，也是一个比较难得到的参数。

The conclusions show that most of the agricultural land resources are of good quality. However, the dry land and paddy field covering an area of \{17.11\} km\+2 are contaminated seriously heavy metals, which are not fit for growing crops. At the same time, the high\|quality plowland, which i...

定量评价的结果表明，区域农业土地资源中大部分土地资源质量较好，但旱地和水田共有 1 7.1 1km2 的重金属重度污染区，这部分耕地已不适宜种植农作物，同时，适合人类耕作的高质量耕地由于土壤重金属污染减少了近 1 / 3 ，说明贵阳市区进行土壤重金属污染防治具有重要的意义。

Arbuscular mycorrhizal fungi are important soil microorganisms in agroecosystems. Biodiversity among AM fungi in crop fields is influenced by many factors, including soil properties and plant species.

AM真菌是农业生态系中一类重要的土壤微生物，它在农田土壤中的发生和分布受多种环境因素的影响。

In this paper,researching progress of allelopathic autotoxicity in agro-ecosystem was briefly reviewed based on many studies collected,including allelochemicals,factors of allelopathy ,mechanism of allelopathy .

本文对化感作用的本质和影响因素，化感中自毒作用对作物连作的影响进行了阐释与介绍，在此基础上综述了植物化感自毒作用与土壤病虫害发生、土壤微生物之间的关系，并对化感及自毒作用在农业生态系统中的应用和前景进行了展望。

The current soil utilization and the relevant problems are analyzed, and measures about sustained agricultural development in Zhangjiakou are proposed: planting trees, create an ecological protector for the Beijing,Tianjin and Hebei; adjust the structure of crop, organize the production of output in different regions; adjust the structure of droves; utilize the irrigable land nationally, develop no-public Hazarded vegetable production intensively and son on.

本文通过对张家口地区的土地利用现状的调研与评价及其农业中存在问题的分析，提出了本地区农业可持续发展的对策：乔灌成网，构筑京张承生态三角，建设京津冀北地区的生态屏障；调整作物生产结构，组织区域间产品互补生产；调整畜群结构，发展舍饲生产；合理利用水浇地，集约生产错季无公害蔬菜；增施有机无机肥料，培肥土壤肥力。

Based on the field experiment data of winter wheat blending irrigation by saline water in Nanpi Ecological Agriculture Experimental Station of the Chinese Academy of Sciences from 2002 to 2005, the effects of blending irrigation with mineralization of 0.84, 3, 4 and 5 g/L on the soil salification rate, soil sodium adsorption ratio of soil saturation extract as well as winter wheat yield and yield constitute factors irrigated were studied in order to determine upper limit of irrigation mineralization suitable for the location.

根据中科院南皮生态农业试验站2002～2005年的冬小麦微咸水混灌田间试验资料，以淡水为对照研究了矿化度分别为3、4、5 g/L的微咸水混灌对土壤积盐率、土壤饱和浸提液钠吸附比、冬小麦产量和产量构成因素以及水分利用效率的影响，从而确定适宜的灌溉水矿化度上限。

This research depends on production and attestation etc. key problems urgently resolved to develop the green fruit in KELAMAYI Arid-desert Areas. According to "Green food technical guideline for the assessment of the area's environment quality condition"promulgated the green food developmental center of China, Environment quality of KELAMAYI green fresh grape growing area, included the atmosphere, soil and irrigation water, had been monitored and evaluated; The inquisition studied the present condition of the red globe grape cultivation management in KELAMAYI agriculture developmental area; Examined sense organs, physics and chemistry, health index sign of the red globe grape that the grape base produce.

本研究针对克拉玛依干旱荒漠区发展经济林果产业中迫切需要解决的绿色果品生产和认证等问题，根据《绿色食品产地环境质量现状评价技术导则》的要求，对克拉玛依农业开发区葡萄生产基地的大气、土壤、灌溉用水环境质量进行了监测评价；调查研究了克拉玛依农业开发区葡萄生产基地红地球葡萄栽培管理现状；检测了该基地所产红地球葡萄的感官、理化、卫生指标。

In terms of physical and chemical properties, the fertilization of fruit orchard soil in Hongyan village is higher than that of any other region in Guangxi and the soil pH value is gradually developing towards that in the maturity soil.

生态农业旅游活动的开展与土壤环境有一定的关系，本文以广西恭城红岩村生态旅游景观区为例，分析了旅游对土壤物理性质、化学性质的影响。

In the second chapter, soil survey results of the National Experimental Station for Precision Agriculture were provided.

论文的第二章主要基于精准农业中变量技术的要求，对作物生长的环境实现变量管理，对小汤山国家精准农业示范区内的土壤类型和理化性状进行了调查和分类。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。