2. Assignment Topic –Agrobiology principles,law of Minimum Mitscherlich law, Baule Unit,Inverse yield Nitrogen law. Submitted to Presented by Dr. Dinesh Shah Saurabh Kumar Associate professor M.sc agronomy (Department of agronomy) (1 st semester) Assignment Topic –Agrobiology principles,law of Minimum Mitscherlich law, Baule Unit,Inverse yield Nitrogen law. Submitted to Presented by Dr. Dinesh Shah Saurabh Kumar Associate professor M.sc agronomy (Department of agronomy) (1 st semester)

3.  Term given by Willcox in 1928.  Study of life process in agriculture.  Agrobiology is the science of plant nutrition and growth in relation to soil condition specially in determine ways to increase crop yield.  Study about the external factor of plant rather than physiology.  Also a division of agricultural science which consider the general relation.  Term given by Willcox in 1928.  Study of life process in agriculture.  Agrobiology is the science of plant nutrition and growth in relation to soil condition specially in determine ways to increase crop yield.  Study about the external factor of plant rather than physiology.  Also a division of agricultural science which consider the general relation.

4.  Agrobiology and Agronomy both are the division of agricultural science but Agronomy also deals with the cost and production while Agrobiology deals with the maximum yielding capacity under well defined condition.  Agrobiology focus only on the growth factor and perfect environment but agronomy also focus on the plant physiology.  Agrobiology and Agronomy both are the division of agricultural science but Agronomy also deals with the cost and production while Agrobiology deals with the maximum yielding capacity under well defined condition.  Agrobiology focus only on the growth factor and perfect environment but agronomy also focus on the plant physiology.

5.  General and specific quantitative relation of plant with the external factor of growth.  EMPHASIS-determine perfect environment -growth(an increase) -growth factor  General and specific quantitative relation of plant with the external factor of growth.  EMPHASIS-determine perfect environment -growth(an increase) -growth factor

6.  Wilcox considered mainly concepts are- 1-Mitscherlich’s law of equation. 2-Baule unit 3-Inverse yield of nitrogen law 4- N-318 constant  Wilcox considered mainly concepts are- 1-Mitscherlich’s law of equation. 2-Baule unit 3-Inverse yield of nitrogen law 4- N-318 constant

7. LAW OF MINIMUM  This law is given by J.V.Liebig in 1840.  Liebig was a German chemist who was work on organic chemistry and also called the father of fertilizer industry.  Before this law ‘Humus theory’ of Albert Thaer was popular.  This law states that ‘The growth of plant is directly affected by the amount of nutrient which in smaller quantity but all other are present in adequate amount’. LAW OF MINIMUM  This law is given by J.V.Liebig in 1840.  Liebig was a German chemist who was work on organic chemistry and also called the father of fertilizer industry.  Before this law ‘Humus theory’ of Albert Thaer was popular.  This law states that ‘The growth of plant is directly affected by the amount of nutrient which in smaller quantity but all other are present in adequate amount’.

8.  Yield show the linear response to that nutrient. Yield ∝ nutrient which is minimum  Equation - Y = M X + C  Where, y =yield x=input m=proportionate c=constant  Yield show the linear response to that nutrient. Yield ∝ nutrient which is minimum  Equation - Y = M X + C  Where, y =yield x=input m=proportionate c=constant

10.  This law is geven by the Eilhard Alfred Mitscherlich in 1909.  He gave the law of diminishing yield increment.  Also called the advancement of the law of minimum.  He observed that ‘when plants were supplied with adequate amounts of all but one nutrient,their growth was proportional to the amount of this one which is not in optimum quantity’ and that an ‘increase in yield will be smaller and smaller in comparison of previous production’.  This law is geven by the Eilhard Alfred Mitscherlich in 1909.  He gave the law of diminishing yield increment.  Also called the advancement of the law of minimum.  He observed that ‘when plants were supplied with adequate amounts of all but one nutrient,their growth was proportional to the amount of this one which is not in optimum quantity’ and that an ‘increase in yield will be smaller and smaller in comparison of previous production’.

11. yield Growth factor Diminishing increment of growth-y 1 >y 2 >y 3 >y 4

12.  Mathematical equation dy ∝ A - Y dx dy = (A-Y)C dx where, dy =response rate dx A = max. possible yield Y = yield obtained from given factor C = proportionality constant  Mitscherlich found the value of c was 0.122 dz for N,0.6 dz for P and 0.4 dz for K.  C ∝ 1 nutrient demand  Mathematical equation dy ∝ A - Y dx dy = (A-Y)C dx where, dy =response rate dx A = max. possible yield Y = yield obtained from given factor C = proportionality constant  Mitscherlich found the value of c was 0.122 dz for N,0.6 dz for P and 0.4 dz for K.  C ∝ 1 nutrient demand

13.  Importance  Response decreases dose after dose.  Assumption  Asymtotic response-curvature zero and no downward movement of curve.  Drawbacks  C does not cover the wide variation of cultivation.  Symptotic curve – curve is qudratic not to be asymptotic.  Importance  Response decreases dose after dose.  Assumption  Asymtotic response-curvature zero and no downward movement of curve.  Drawbacks  C does not cover the wide variation of cultivation.  Symptotic curve – curve is qudratic not to be asymptotic.

14.  Unit of growth factor is designated as a “baule”according to the German Mathematician,Baule in 1920.  ‘One baule unit of nutrient increases yield 50% of difference between present yield and maximum possible yield’.  1 baule of N = 1 baule of P 2 O 5 = 1 baule of K 2 O =50% of max. possible yield  The values of baule unit in pounds per acre of N,P 2 O 5 and K 2 O are 223,45,76 respectively.  Unit of growth factor is designated as a “baule”according to the German Mathematician,Baule in 1920.  ‘One baule unit of nutrient increases yield 50% of difference between present yield and maximum possible yield’.  1 baule of N = 1 baule of P 2 O 5 = 1 baule of K 2 O =50% of max. possible yield  The values of baule unit in pounds per acre of N,P 2 O 5 and K 2 O are 223,45,76 respectively.

15. 1 baule = 50% yield 2 baule = 75% yield 3 baule = 87.5% yield 10 baule = 99.9% yield Equation- logA – log (A-y) = cx from this equation c = 0.301 then, log(100-50)=log100-cx x = log 2 c from this value we can find N = 225 x = 0.301 =2.25dz =225 and so on….. 0.122 1 baule = 50% yield 2 baule = 75% yield 3 baule = 87.5% yield 10 baule = 99.9% yield Equation- logA – log (A-y) = cx from this equation c = 0.301 then, log(100-50)=log100-cx x = log 2 c from this value we can find N = 225 x = 0.301 =2.25dz =225 and so on….. 0.122

16.  Given by Willcox in 1928.  Law states that ‘power of growth or yielding ability of any crop plant is inversely proportional to the mean nitrogen content in the dry matter’.  A crop plant with high mean percentage of nitrogen in dry matter has less dry matter production potential than a crop plant with low percentage of nitrogen.  Given by Willcox in 1928.  Law states that ‘power of growth or yielding ability of any crop plant is inversely proportional to the mean nitrogen content in the dry matter’.  A crop plant with high mean percentage of nitrogen in dry matter has less dry matter production potential than a crop plant with low percentage of nitrogen.

17. y ∝ 1 N(%)content in dry matter y = k n k = yn where, y=dry matter yield k= N uptake y ∝ 1 N(%)content in dry matter y = k n k = yn where, y=dry matter yield k= N uptake

18. CROP YIELD (Q/Ha) N(%) soybean 20 2.5 Wheat 40 1.2 sugarcane 800 0.3

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