【摘 要】
：
在甜菜生长期中,有人认为甜菜叶片多、叶丛繁茂,擗去一些叶片不会影响产量或影响不大。还有人认为,在甜菜生长过程中,有些外层叶片会自然衰老枯死,还不如早
In the beet gr
【机 构】
：
吉林农业大学,吉林农业大学,吉林农业大学,吉林农业大学
论文部分内容阅读
在甜菜生长期中,有人认为甜菜叶片多、叶丛繁茂,擗去一些叶片不会影响产量或影响不大。还有人认为,在甜菜生长过程中,有些外层叶片会自然衰老枯死,还不如早
In the beet growing season, some people think that there are many beet leaves and lush foliage, and some leaves do not affect the output or have little effect. Others think that in the beet growth process, some of the outer leaves of the natural aging dead, not as early as
其他文献
金秋的北京,宣武门路口,一幢以贵妃红大理石裙楼作“基座”、乳白色衬墙和茶色玻璃幕相间的锥顶塔式高楼显得格外壮观,这就是新华社新闻大厦。它好像一枚即将点火腾空的火箭
Nymphs of Stenoscepa sp. feed on leaves of the Ni hyperaccumulator Berkheya coddii at serpentine sites in Mpumalanga Province, South Africa. These sites contain
We studied the process of offspring production in queenless colonies of Acromyrmex subterraneus brunneus, and particularly evaluated the ovary development of wo
单簧管是一种在西方孕育发展的木管气鸣乐器.漂洋过海传入中国后,得到了长足的发展.中国这片具有极强包容性的土壤为其提供了丰富的养分.单簧管艺术开始了其丰富多彩的“中国
轮作(Rotation)是用地养地相结合的一种生物学措施。大量试验证明轮作不仅可以协调不同作物之间养分吸收的局限性，增加土壤中养分的有效性，还可以通过根系分泌的变化，减少自毒作
Effects of CaCl2,CuCl2,ZnCl2 and PbCl2 on development and hatching Success of eggs of Folsomia candida(Collembola)were studied under laboratory conditions.Thous
Bamboo stumps can be a congenial breeding habitat of the mosquitoes.In view of this,a preliminary assessment of the dipteran immatures inhabiting the stumps of
服装摄影属于摄影中的其中一种,主要针对如何展示服装进行拍摄.不仅需要对服装搭配知识和面料有所了解,对摄影技术也有较高的要求,在拍服装的同时会涉及到人物的拍摄,所以服
The developmental rate under low temperatures and cold tolerance were investigated in embryos of the blowfly Lucilia sericata.The larvae of this species are now
辽阳县黄泥洼镇马泉村种粮大户巴常荣,1988年种7亩玉米高产田,1989年又种了7亩玉米高产田,亩产分别为997公斤和948.8公斤,两年均获得了辽宁省玉米高产竞赛二等奖。1990年扩