Chapter 9 Fertilizers and environmental
Fertilizers and Environmental Chapter 9
The principles of application fertilizers Law of the Minimum: the crop's yield is restricted by the lack of one element, even Mg Cu Zr Mr Mo Ca though there may be sufficient quantities of all the other elements
The principles of application fertilizers Law of the Minimum:the crop’s yield is restricted by the lack of one element, even though there may be sufficient quantities of all the other elements
The principles of application fertilizers Law of Diminishing Return Yield 报酬递减律 the response of a plant to the addition of a growth will become smaller and smaller as Kg N 100120 the amount of the growth factor increases
Law of Diminishing Return 报酬递减律 the response of a plant to the addition of a growth will become smaller and smaller as the amount of the growth factor increases The principles of application fertilizers
Yield or growth cure Deficient Sufficient Toxicity 一6 Relative Follar Nutrient Content
Yield or growth cure
Fertilizer use and agricultural production Number of Fertilizer people consumption supported by Grain yield kg NPK per Year one hectare per hectarehectare 1800 0.8 0.73 1875 1.3 1.20 3.1 1900 1.6 1.84 15.6 1925 2.28 39 1950 3.3 98 101.9 1975 4.6 4,43 233.5 1978 4.5 4.63 2558
Fertilizer use and agricultural production Year Number of people supported by one hectare Grain yield per hectare Fertilizer consumption kg NPK per hectare 1800 0.8 0.73 - 1875 1.3 1.20 3.1 1900 1.6 1.84 15.6 1925 2.1 2.28 43.9 1950 3.3 2.98 101.9 1975 4.6 4.43 233.5 1978 4.5 4.63 255.8