大田

The effects of sodium polyacrylate on soil, water-holding capacity at different suctions of sand,silt and clay were evaluated by using centrifugal Method.

2%与1%对3种土壤持水能力的影响；采用大田试验研究了地表撒施2 g/m2SP对冬小麦与下季玉米产量及WUE影响。

This paper has made systematic research about characteristics of soil water dynamic changes, water deficit of the root-zone of pear-jujube tree with regulated deficit irrigation, physiological control in the process of the water use and the stomal response mechanism of pear-jujube tree under the water deficit environment, and the effects of different deficit irrigation levels at different growth stages vegetative growth and repproductive growth of pear-jujube trees, and also its regulation mechanism.

针对西北半干旱区果业生产面临水资源紧缺的现实，论文以该区特色经济果树梨枣树为研究对象，在西北农林科技大学旱区农业水土工程教育部重点实验室、陕西省大荔县城关镇梨枣园分别开展了温室与大田试验，对调亏灌溉的梨枣树根区土壤水分动态变化特征、水分亏缺与复水环境下梨枣树用水过程、生理调控与气孔响应机理、不同生育期不同水平亏水处理对营养生长与生殖生长的影响及其调控机制等进行了较系统的研究，分析了各生育期不同亏水处理对梨枣耗水规律、产量、品质、作物系数、水分利用效率及经济效益的影响，取得了以下成果：⑴通过亏水处理与复。。。

This article mainly analyses the differences between the garden precision seeder and farming ones,reviews the types and developing situation of seeders at home and abroad,and introduces the working principle and characteristics of all kinds of greenhouse garden precision seeder s.

对温室园艺精量播种机与大田精量播种机之间的区别以及国内外播种机的类型和发展现状进行了论述，并对各种温室园艺精量播种机的工作原理及特点进行了简要分析。

Rice, cotton and vegetables seeds are sometimes grown in special seedbeds before they are planted in the field.

有时把稻种、棉花、蔬菜种子种在专门的苗床上，再移植到大田。

Rice,cotton and vegetable seeds are sometimes grown in special seedbeds before they are planted in the fields.

有时把稻种，棉花，蔬菜种子种在专门的苗床上，再移植到大田。

03 P45 Rice,cotton and vegetables seeds are sometimes grown in special seedbeds before they are planted in the field.

19.03 有时把稻种、棉花、蔬菜种子种在专门的苗床上，再移植到大田。

Transfer of the plantlets with roots to soil resulted in a more than 90% survival rate.

具有根系的再生植株移栽至大田后的存活率在90%以上。

Daejeon The company occupies 20,000 square meters, equipped with world-leading levels of production and research and development equipment.

大田公司占地2万平方米，配备有世界领先水平的生产及研发设备。

The result showed that the effects were the best using quick-acting fertilizer as the base manure, when fertilizing to the saplings 2 to 3 months before they sprout and to the grown up fruit trees in December.

采用果苗盆栽和大田栽培2种试验方法，在不同时期，施入基肥与追肥后，定期对果树的生长发育情况进行测量，研究速效肥作基肥，不同施肥时期对幼树和成年果树生长的影响；速效肥作追肥，不同施肥时期对果树营养生长、结果和产量的影响；有机肥作基肥，不同施肥方法对产量的影响。

Fallow lands of winter wheat in the southern part of loess plateau with an annual precipitation of 632mm were selected as the study object, Field and lab experiments were carried out during two wheat growth periods to investigate the correlations between N2O emissions and its influential factors, quantitative model and energy characteristics.

本研究以年均降水量为632mm的黄土高原南部旱作区冬小麦—休耕地土壤为对象，通过两个小麦生长年度不同处理的大田试验和相应的室内实验，对土壤N_2O排放量及其与影响因子的关系、定量模型和能量特征进行了系统研究。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。