【摘 要】
：
通常把作物倒伏看作是植物对外界环境(大风、暴雨)等的机械反应。但这是一种简单的看法。因为在很大程度上倒伏现象与其营养状况是紧密相联的。即营养状况决定着茎杆偏离垂
论文部分内容阅读
通常把作物倒伏看作是植物对外界环境(大风、暴雨)等的机械反应。但这是一种简单的看法。因为在很大程度上倒伏现象与其营养状况是紧密相联的。即营养状况决定着茎杆偏离垂直轴程度的大小。如果茎秆节间完全垂直排列,形成单一的轴,那么在其他条件相同情况下,抗倒性即最强。节间连接点如出现的角度越明显,植株倒伏即越严重。即使在
The lodging of crops is often seen as a mechanical response of plants to the external environment (strong winds, heavy rains) and the like. But this is a simple view. Because to a large extent the phenomenon of lodging and its nutritional status are closely linked. The nutritional status determines the size of the stem from the vertical axis. If the internodes are arranged vertically vertically to form a single axis, the lodging resistance is strongest under otherwise identical conditions. If the point of emergence of internodes is more obvious, the lodging of plants is more serious. Even though
其他文献
An efficient quantum secure direct communication network protocol with the two-step scheme is proposed by using the Einstein-Podolsky-Rosen (EPR) pair block as
The distorted-wave Bo approximation (DWBA) method is used to calculate the half-lives of spherical proton emitters. The calculated results are in agreement with
甜菜是甜菜制糖工业的的基础。甜菜制糖工业要取得较好的经济效益,在很大程度上取决于甜菜的产量和含糖率。而这一切与甜菜品种的种性和种子质量的优劣都有直接的关系。因此
We investigate the boundary-layer flow on a moving permeable plate parallel to a moving stream. The goveing equations are solved numerically by a finite-differe
A model for studying the ionization effects in a microwave tube has been developed. This model is simulated by a two-dimensional particle-in-cell code with the
Temperature dependence of viscosity for more than ten kinds of metallic melts is analysed based on viscosity measurements. An obvious tuing point is observed on
We investigate hard photon production of the near-collinear bremsstrahlung and a new process called the inelastic pair annihilation, fully including the LPM eff
Energy conversion efficiency of the dye-sensitized solar cell is improved from 3.5% to 4.5% by adding a small amount of CuI into an ionic liquid electrolyte. It
The quantum well (QW) semiconductor lasers have become main optical sources for optical fibre communication systems because of their higher modulation speed, br
在北京台基厂路有个“奶奶”商店专卖老百货,店面不足百平方米,玻璃柜台一米多高,雪花膏香脂样样齐全。姑娘老太都爱逛,明星大腕也捧场,每天顾客六七百,物美价廉生意好。老式