The results showed that the winter wheat planting area of Ke.
采用图像复合分类监测、比值 (差值 )图像监测、分类结果叠加监测和信息复合人机交互目视提取等方法研究了垦利县 1987～ 1998年冬小麦播种面积及其空间分布的动态变化。
Based on the cost-income data (1980-2002) of farm produce and the China Agricultural Yearbook, taking these main crops in the progress of the arable land use as a case study, this paper studied the regional differences in the changes of the agricultural land use in China during the period 1980-2002 from three aspects as the degree of intensity, the sown area and the abandonment of the arable land.
依托1980￣2002年的中国农产品成本收益资料与中国农业统计年鉴等基础数据,从集约度、播种面积与耕地撂荒变化三个方面,对中国1980年以来农地利用变化的区域差异进行了研究。
Based on the cost-income datum(1980～2002) of farm product and the China Agricultural Yearbook,taking these main crops in the progress of the arable land use as a study case,this paper studied the characters and its driving force for the annual changes of the degree of intensity,the sowing area and the abandonment of the arable land.
该文依托1980~2002年的全国农产品成本收益资料与中国农业统计年鉴等基础资料,以农地利用过程中的主要农作物为例,对农地利用过程中集约度、播种面积与耕地撂荒变化的时序特征及其驱动因素进行了研究。
Potential dynamics of agricultural crop sown area has attracted a wide range of attention from numerous researchers due to its ecological and socio-economic implications.
农作物播种面积动态变化因其重要性已经引起了国内外学者的广泛关注。
The sown area of grain was decreased by 30.7 percent to 3.207 million mu.
粮食播种面积为320.7万亩，调减幅度为30.7%；
The plant protection coverage in other major crops such as rice, sugarcane, wheat, fruits and vegetables is only limited to 15-20% of the cropped area.
水稻、甘蔗、小麦、水果和蔬菜的植保面积只限于播种面积的15~20%。
Meanwhile, the total sown area was 3,404,120 ha, double the 1955 figure.
全疆总播种面积达到3404.12千公顷，比1955年扩大1倍；
Analysis of the Influence of Grain Price Changes on the Acreage of Grain;
浅析粮食价格变动对粮食播种面积的影响
Analysis on Fluctuation of Soybean Acreage in China:Trend,Reason and Policy Suggestion;
中国大豆播种面积波动:趋势、成因及政策建议
Modeling sown area change for major crops during 2005~2035 at a global scale;
2005~2035年全球农作物播种面积变化情景模拟研究
The grain-sown area will be stabilized at about 110 million ha through the increase of the multiple crop indexes.
通过提高复种指数，使粮食作物播种面积稳定在1.1亿公顷左右。
Regression model on the total value of agricultural output against the cultivated area of the crops in Baotou
包头市种植业总产值对农作物播种面积的回归模型
Changes of the Rice-Seeded Area in Beijing and Tianjin Region during the Past 50 Years and Its Responses to the Changes of Precipitation
京津地区近50年来水稻播种面积变化及其对降水变化的响应研究
Factors Related to Changes in Sown Area of Major Crops in Zhejiang Province;
浙江省近期农作物播种面积的变化及其主导因素分析
Among all of the grain crops in the province, dryland corn on Black soils ranks first in planting acreage, accounting for half of total arable land in the province.
在全省粮食作物中，旱地黑土玉米播种面积位居榜首，占全省总耕地面积一半。
We must protect primary farmland, keep the area sown to grain stable, improve the structure of grain varieties grown and increase the per unit area yield of grain.
要保护好基本农田，稳定粮食播种面积，优化粮食品种结构，着力提高粮食单产。
Based on data of drought and waterlogging disaster and planting area etc., this paper analysed the temporal and spatial variation characteristics of drought and waterlogging disaster in Heilongjiang province.
根据旱涝灾害和播种面积等资料，分析黑龙江省旱涝灾害的时空变化特点。
We need to protect arable land, especially basic farmland, stabilize the acreage sown to grain, and expand overall grain production capacity.
要切实保护耕地特别是基本农田，稳定粮食播种面积，不断提高粮食综合生产能力。
Study on Meatreament of Wheat Planting Area Using P6 AWiFS Imagery Based on Mixed-Pixel Decomposition Combined with Decision Tree;
基于决策树和混合像元分解的P6 AWiFS遥感影像小麦播种面积测量方法研究
Effect of Sowing Date on Yield and LAI of Supper Japonica Rice
播种期对粳型超级稻产量及叶面积指数的影响
The area ploughed, sown and harvested by machines exceeded 300,000 hectares, and the area planted to improved strains reached 160,000 hectares, or 72 percent of the region's total farmland.
全区机耕、机播、机收面积总量达３０多万公顷，良种推广面积达16万公顷，良种覆盖率72％。
In determining the attenuation for an areal array we must specify the direction of the wave travel.
在测定一种面积组合的压制性能时，我们必须明确波的传播方向。