extensive crop 中文意思是什麼
extensive crop
解釋
粗放作物-
Precision agriculture ( pa ) is a very important direction for agriculture development in 21st century. pa will promote the change from extensive agriculture to knowledge and technology - based agriculture. in developed countries, pa is considered as a revolution of crop production and management at the threshold of the new millennium
精細農業是21世紀農業發展的一個重要方向，將推動粗放型農業向知識型、技術型的現代農業轉變，在發達國家已被認為是跨世紀作物生產管理的一場革命。 -
Rubber tree ( hevea brasiliensis ) is an important economic woody - crop in tropical areas. its latex is the unique source of crude rubber used in current industry. because of its special and important use, the rubber tree has been extensively planted in tropical areas. increase production is always the main target in rubber tree cultivation. since the ethrel was applied in increasing latex production in 1968 for the first time as a chemical stimulant, not only the latex production had been increased largely, but also a new set of rubber tapping system had been established, leading to a series of economic benefit. owing to ethrel " s extensive application, its side effects had been found more and more obviously, such as tapping dry, speeding up senescence, shortening the life span of rubber tree etc. in order to overcome the side effects and increase production more availably, for a long time, people had carried out lots of research work on cell level, membrane level, physiology and biochemistry of laticifer contents. but the mech anism why ethrel increased latex production was not yet understood completely. this study had cloned the ethylene receptor gene ( efrl ) from rubber tree, and researched the relationship between etrl expression in laticifers and ethrel stimulation on transcription level and protein translation level. the results were as follows : 1
但是，由於乙烯利應用的普及，乙烯利刺激割膠引起橡膠樹發生死皮病及加速膠樹衰老，縮短膠樹壽命等副作用也越來越明顯。為了克服這些副作用，使乙烯利能更有效地刺激增產，長期以來，人們在細胞水平、膜水平和乳管細胞內含物的生理生化層面上進行了大量的研究，但仍未完全了解乙烯對膠樹的作用機制。本研究從分子水平入手，克隆橡膠樹的乙烯受體基因（ etr1 ） ，並在轉錄水平和蛋白質翻譯水平上研究etr1基因在乳管細胞中的表達及與乙烯刺激的關系，取得了以下結果： 1 -
Zhejiang is a strong province in agriculture. with the planting area of great profit crop becoming large and the worth ascending, contaminated food, food poisoning and export of farm product meeting with a check by superscales of pesticide, heavy metals and nitrates get a extensive attention
浙江是一個農業大省，隨著經濟農作物種植面積的擴大和產值的上升，農藥、重金屬和硝酸鹽超標引起的食物污染、食物中毒和農產品出口受阻已受到人們的廣泛關注。
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