Determining heating pipe temperature in greenhouse using proportional integral plus feedforward control and radial basic function neural-networks     

余朝刚应义斌  王剑平杨佳 《浙江大学学报(A卷英文版)》2005,6(4):265-269

INTRODUCTION The objective of greenhouse environment controlis to create an ideal climatic condition for plant growth.The interior air temperature is the most importantcontrol factor. Generally, heating facilities must beinstalled in the greenhouse in order to make the inte-rior air meet the need of the crop in cold days. Hotwater heating is the prevailing method. In order tosave energy, precise temperature control is necessary(Chalabi et al., 1996). For precise control of interior…  相似文献   

西藏温室蔬菜农药安全使用措施     

阿梅 《西藏科技》2004,(9):8-9

西藏温室生产的反季节蔬菜病虫害以灰霉病、温室粉虱、棉蚜等为主。改进温室结构，加强温室管理，播前做好室内清洁，熏杀残存病虫，合理安排蔬菜茬口，选用抗病品种以压低病虫发生程度，减少农药的用量。病虫防治用药要选用低毒、低残留农药，严禁使用高毒、高残留品种。针对病虫特点，选用高效的制剂，为降低室内湿度，提高防效、施药等技术，严格执行施药蔬菜采收安全间隔期。  相似文献