【摘 要】
:
冷、烂、锈田是低产田的一种类型,主要分布在山区、半山区、丘陵区,面积较大,常年亩产250~30公斤,少则100~150公斤。其低产原因是:地下水位高,土壤通气状况不良,土温低,硫化氢
论文部分内容阅读
冷、烂、锈田是低产田的一种类型,主要分布在山区、半山区、丘陵区,面积较大,常年亩产250~30公斤,少则100~150公斤。其低产原因是:地下水位高,土壤通气状况不良,土温低,硫化氢等还原性毒物多,速效养分含量少,供肥性差,耕性不良,水稻移栽后常出现黑根、坐蔸、僵苗、甚至死亡。改良的方法如下:
Cold and rotten, rusty field is a type of low-yield field, mainly distributed in mountainous, semi-mountainous and hilly areas, with a large area. Annual perennial mu produce 250 ~ 30 kilograms, ranging from 100 ~ 150 kilograms. The causes of low yield are: high groundwater level, poor soil aeration, low soil temperature, hydrogen sulfide and other reducing toxic substances, less available nutrient content for poor fertility, poor tillage, black transplanting rice often appear, , Stiff seedlings, and even death. Improved method is as follows:
其他文献
挥发性醛类物质是黄瓜果实的特征香气化合物,其中脂氢过氧化物裂解酶(HP L)是醛类挥发性物质合成下游的关键酶。为探索黄瓜CsHPLs基因参与黄瓜醛类合成进而解析其功能,本试验以
Since roaming was found as a new but common reaction path of isomerization, many of its properties, especially those of roaming transition state (TSR), have bee
Traditional geoacoustic inversions are generally solved by matched-field processing in combination with metaheuristic global searching algorithms which usually
矮牵牛(Petunia hybrida Vilm)是一种重要的花卉植物。性喜温暖、喜阳光,不喜炎热雨涝,不耐霜冻。为了矮牵牛能向产业化与规模化快速发展,以及为育种工作提供有利资料,本试验
强调教学是教与学的交往互动,师生双方相互交流、相互沟通、相互启发、相互补充,在这个过程中教师与学生分享彼此的思考、经验和知识,交流彼此的情感、体验与现念,充实教学内
图书馆是利用书刊资料传播科学文化知识,培养有创新精神和独立见解人才的知识宝库.它是学校中必不可缺的一个部门,与学校的教育、教学密切相关.在职业教育快速发展的今天,图
“创业”对现在的高职学生来说,是一个非常值得期待的归宿.但如何促进高职学生就业和创业,使他们学以致用,更好地为社会和国家服务仍是一个值得深入探讨的话题.笔者认为,首先
Traffic interruption phenomena frequently occur with the number of vehicles increasing.To investigate the effect of the traffic interruption probability on traf
Significant and persistent trajectory-to-trajectory variance are commonly observed in particle tracking experiments, which have become a major challenge for the
番茄(Solanum lycopersicum)是茄科的重要代表植物,由于它较高的产量和丰富的番茄红素,经济利用范围广泛,是目前设施栽培面积最大的蔬菜之一,生长发育易受到不利环境条件的影