...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>日本作物學會紀事 >Studies on the Growth and Productivity of Maize for Whole-Plant Silage in the North-Marginal Area, Nemuro District in Hokkaido : IV. Effects of planting density on dry-matter accumulation habits and yield
【24h】

Studies on the Growth and Productivity of Maize for Whole-Plant Silage in the North-Marginal Area, Nemuro District in Hokkaido : IV. Effects of planting density on dry-matter accumulation habits and yield

机译：北海道尼姆罗区北边缘地区玉米玉米生长和生产率研究：IV。种植密度对干物质积累习惯的影响及产量

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The objective of this study was to investigate the effects of planting density on the dry-matter (DM) production and yield of maize for whole-plant silage in the north-marginal area in Japan (where accumulated temperature from June to September is 1946°C). Experiments were conducted for 5 years from 1978 to 1982, based on the same design. Wase-homare (early hybrid) was grown at four planting densities from 40, 000 to 100, 000 plants/ha in 1978∼1980 and from 58, 000 to 103, 000 plants/ha in 1981 and 1982 (Table 1). DM weights in each organ and leaf area were measured at the 4th-, 7th-, 11th-leaf fully developed stages, silking stage, and, 3 and 6 weeks after silking. DM yields and percentage of barren plants were measured at harvesting date. The results obtained were as follows : I. As planting desity increased, top growth rates (TGR) during the vegetative growth period were increased. Contrarily, TGR during the ear-filling period were decreased rapidly, resulted in the minimum at the highest planting density of about 100, 000 plants/ha during the latter half of the ear-filling period (Fig. 1). It was due to rapid decrease of net assimilation rates (NAR) during the ear-filling period in high planting density causing increase of mutual shading and specific leaf area (SLA) (Table 2). 2. The optimum leaf area index (LAI), under which maximum TGR obtained, during the ear-filling period, was about 3.0 in all the years (Fig. 5). The planting density which gave the optimum LAI of about 3.0 during the ear-filling period was obtained at the planting density of 73, 000 plants/ha (Fig. 1). 3. The maximum ear growth rates (EGR) during the latter half of the ear-filling period were obtained at 60, 000∼80, 000 plants/ha, and EGR decreased at the higher planting density than the above. Furthermore, the declines of EGR at the higher planting density were promoted in the cold years of 1980 and 1981 (Fig.2). 4. The incidence of barren plant was obviously increased with increasing planting density (Table 2). It reached above 20% as NAR during the latter half of the ear-filling period decreased below 2.0g/m2/day (Fig. 4). 5. Although the highest ear DM yields were obtained at the medium planting density as 60, 000∼80, 000 plants/ha, stover DM yields and total DM yields increased with increasing planting density. Percentage of dry-matter in whole-plant did not differ significantly among planting densities in most years. Ear/Total ratio was decreased and maturity was delayed with increasing planting density (Table 3). 6. It was concluded that the optimum planting desity was about 70, 000∼75, 000 plants/ha for high yield and high quality of maize for whole-plant silage in the north-marginal area.
机译：本研究的目的是探讨种植密度对日本北边缘地区的全植物青贮饲料干物质（DM）生产和产量的影响（从6月至9月的累积温度为1946° C）。基于相同的设计，在1978年至1982年进行了5年的实验。 1988年和1982年，1978~1980，1978年至1982年，在40,000至100,000株植物/公顷的四个种植密度和58,000至103,000株植物/公顷（表1）的芥末宿主（早期杂交）生长。每个器官和叶面积中的DM重量在4-，7-，11叶完全发育的阶段，纯洁阶段，3周和丝绸后3周测量。在收获日期测量DM产量和贫瘠植物的百分比。得到的结果如下：I.由于种植休耕增加，营养生长期期间的顶部生长率（TGR）增加。相反，在耳填充时段期间的TGR迅速下降，导致在耳朵填充周期的后半部分（图1）的后半部分的最高种植密度的最小种植密度。它是由于在高种植密度的耳灌装期间净同化速率（NAR）的快速减少，导致互相遮阳和特定叶面积（SLA）增加（表2）。 2.在耳朵填充期间获得最大TGR的最佳叶面积指数（LAI）在耳朵填充期内为约3.0（图5）。在73,000株植物/公顷的种植密度下获得在耳填充时段中获得约3.0的最佳LAI的种植密度（图1）。 3.在耳填充时期的后半部分期间的最大耳生长速率（EGR）在60,000〜80,000株植物/公顷，EGR处于比上述更高的种植密度下降。此外，在1980年至1981年的寒冷多年（图2）中促进了较高种植密度的EGR下降。 4.随着种植密度的增加，贫瘠植物的发病率明显增加（表2）。由于耳朵灌装周期的后半部分减少了2.0g / m2 /天（图4）时，它达到高于20％的耳朵。 5.尽管在培养基中获得最高的耳DM产率，但随着种植密度的增加，液体DM产量和总DM产量增加。大多数年份，整个植物干物质的百分比在种植密度下没有显着差异。耳/总比率降低，随着种植密度的增加而延迟成熟度（表3）。 6.结论是，最佳种植休耕为大约70,000〜75,000株/公顷，用于北边际区域的全植物青贮饲料高产和高质量的玉米。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号