【摘 要】
:
随着城市化、工业化进程的加快,大量的农田被征用,使得标准水田面积日益减少,而山地、园地、低丘缓坡等旱地资源相对丰富。特别是近年来在国家占补平衡政策的制约下,各地的新
论文部分内容阅读
随着城市化、工业化进程的加快,大量的农田被征用,使得标准水田面积日益减少,而山地、园地、低丘缓坡等旱地资源相对丰富。特别是近年来在国家占补平衡政策的制约下,各地的新垦造耕地、"旱改水"耕地数量较多,排灌等基础设施条件得到改善,但又无法完全满足常规水稻种植的要求。而稳定粮食生产的刚性目标,必须有效利用现有耕地,提高粮食播种面积,进一步保障粮食安全,节水抗旱稻的推广种植成为必然。
其他文献
The intestinal microbiota is the collection of the living microorganisms(bacteria, fungi, protozoa, and viruses) inhabiting the gastrointestinal tract. Novel ba
Acute recurrent pancreatitis(ARP)refers to a clinical entity characterized by episodes of acute pancreatitis which occurs on more than one occasion.Recurrence o
本试验以3个甜玉米品种‘先甜5号’、‘佛甜2号’、‘浙凤甜2号’为材料,比较其种子发芽与发芽后幼苗生长以及耐热性差异,测定在高温处理下玉米苗叶片中丙二醛(MDA)含量、超氧歧
The noninvasive ablation of pancreatic cancer with high intensity focused ultrasound(HIFU) energy is received increasingly widespread interest. With rapidly tem
针对天津港南疆吹泥围埝工程的施工方案,进行了一系列的室内常规试验、编织袋填充模拟试验、现场观测和离心机模型试验,从袋装土的选用、施工要求、围埝地基的固结速率和围埝
通过工程实例探讨确定滨海地区深层地基土工程性质指标的方法,分析测试指标的失真问题。
Neovascularization was reported to arise early in the adenoma-carcinoma sequence in colorectal cancer(CRC),and the importance of angiogenesis in cancer progress
当前,世界正在掀起一场新的产业技术变革,这种变革反映在农村,就是技术创新和管理创新成果正在借助产业结构调整,以渐进、渗透、跨界方式改造着农村产业,并使农村一二三产业发展出
Gut microbes comprise a high density, biologically active community that lies at the interface of an animal with its nutritional environment. Consequently their