大田

Some fields are infested with wild oats and rye grass (Lolium spp.). Twenty-eight per cent of fields in the 1984 survey were moderately or severely infested with Phalaris minor and these fields yielded 1.4 t/ha compared to 1.9 t/ha for fields without weeds.

一些田块受野燕麦和黑麦草的侵害。1984年的调查表明28%的大田中度或严重受到小粒鹃草的侵害，这些田产量为1.4吨/公顷，而无草害田块产量是1.9吨/公顷。

Some fields are infested with wild oats and rye grass (Lolium spp.). Twenty-eight per cent of fields in the 1984 survey were moderately or severely infested with Phalaris minor and these fields yielded 1.4 t/ha compared to 1.9 t/ha for fields without weeds.

一些田块受野燕麦和黑麦草的侵害。1984年的调查表明28%的大田中度或严重受到小粒虉草的侵害，这些田产量为1.4吨/公顷，而无草害田块产量是1.9吨/公顷。

In order to provide theoretical basis and technological for high-quality and high-yield cultivation of a strong gluten wheat variety,Jimai 20,the experiment studied effects of the radio of nitrogenous fertilizer and potassic fertilizer on yield and qualitly of Jimai 20 under the field conditions with High-yield cultivation.

为了给强筋小麦品种济麦20优质高产配套栽培提供理论依据及技术支撑，在大田高产栽培条件下，研究了氮钾肥施用量及其配比对强筋小麦品种济麦20产量和品质的影响。

Hundreds of isolations were made from the diseased tuber-roots and one fungus,a species of Pythium,predominated....

4病菌似乎在大田内经主权或茎端侵入块根，发展很慢，迄今还只在收获的块茎内发现这个病害。

Several pathogens, including Rhizoctonia and Pythium, are causal agents of this disease and may be introduced into transplant and field production systems on infested plant material Abad et al.

它可通过带病植物材料传染移植苗床和大田生产系统Abad 等

Under the field-grown condition, two straw residue and three nitrogen application rates were designed to investigate the remobilization of assimilation and nutrient absorption.

在大田条件下，设计2种秸秆还田方式和3个氮肥水平，研究秸秆还田与氮肥管理对水稻养分吸收的影响。

And remobilization of carbon reserves in rice subjected to water stress during grain filling.

杨建昌，水稻旱育秧大田期需水特性与节水灌溉指标研究中国农业科学 2000，332

Somatic hybrids grew weakly and took roots hard. By continuous subculture to facilitate to take roots using rhizogenic medium, the regenerants was transplanted on the cropland and backcrossed using cultivar wheat pollen.

体细胞杂种生长势差，生根困难，通过不断地使用生根培养基促进生根，然后移栽到大田中，利用不同播期的小麦花粉回交杂种，获得回交后代。

The nitrate content of rhizomatous vegetable is lower than 198 mg/kg, and the leaf vegetable is 500 mg/kg.

介绍环保型蔬菜专用叶面肥配方设计的研究方法，提出了20个配方进行大田小区试验，优选出的配方经在蔬菜上施用后，产量增加，蔬菜中亚硝酸盐含量低于0.001mg/kg；根茎类蔬菜中硝酸盐含量低于198 mg/kg，叶菜类蔬菜中硝酸盐含量低于50 mg/kg，达到了无公害蔬菜的要求

Sabaigrass had long time for vegetative growth and required enough nutrients, so fertilization can promote growth significantly.

因此，在大田栽培管理中，要保证龙须草地的土壤含水量，在雨水过多的夏季要及时地放掉过多的积水，防止淹水现象的出现。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。