area under crops 中文意思是什麼
area under crops
解釋
播種面積-
Cultivated area ( area under cultivation ) ： refers to farmland which is plowed constantly for growing crops, including cultivated land, newly cultivated land in the current year, farmland left without cultivation for less th an three years and fallow land in the current year, rotation land, rotation land of grass and crops, farmland with some fruit trees, mulberry trees and other trees and cultivated seashore land, lake land, and etc
耕地面積：指年初可以用來種植農作物、經常進行耕鋤的田地，除包括熟地、當年新開荒地、連續撂荒未滿三年的耕地和當年的休閑地（輪歇地）外，還包括以種植農作物為主並附帶種植桑樹、茶樹、果樹和其他林木的土地，以及沿海、沿湖地區已圍墾利用的「海塗」 、 「湖田」等面積。 -
The investigations turned out that with the successive planting of crops the mainly available nutrients accumulated yearly under normal fertilization in the upland fields form yellow soil area, especially the content of p increased obviously
在該地區目前的施肥水平下，旱地長期種植作物後土壤主要有效養分的含量都出現不同程度的增加，其中土壤磷的積累最明顯。 -
Abstract : according to the daga of crops yield and soil fertility changes of long term application of fertilizer and nutrients recycling obtained from ecological stations scatrtered in four typical areas under chinese academy of sciences and state minisetry of science and technology, the circulation ratios of organic carbon, phosphorus and nitrogen in the process of feeding - composting in were put forward in the agricultural system of black soi area, the ratios were about 0. 3, 0. 61 and 0. 49, respectively
文摘:根據中國科學院和國家科技部分佈於四大類型地區的生態站進行的長期施肥及養分循環再利用的作物產量、土壤肥力質量變化研究數據，提出了黑土區農業系統投料中有機碳和磷、氮在飼養? ?堆腐過程中的循環率。 -
Under the pressures of population increase, arable land decrease, water shortage, planting area reduction of three major grain crops ( rice, wheat and maize ) in recent years, there is a potential crisis in food security in china
摘要在人口增加、耕地面積減少、水資源缺乏以及水稻、小麥和玉米三大糧食作物種植面積下降等因素的影響下，中國食物安全存在著潛在的危機。
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