Chapter 1 Introduction. Population and Food Production. Increasing population needing to be fed will fuel interest in finding and developing new practices to improve food production Interest in improved soil nutrient management today as world population grows. World Population. World Food.
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Father of Agricultural Chemistry
Relationship of wheat grain yield, soil test P and percent sufficiency of soil P.
How can 0 pp2m be 25% sufficient?
Long term N-P-K Experiments(1969-2004)
Polynomial models have two or more terms where a constant (like the slope in the linear model) is multiplied times the value representing the level of available nutrient.
y = a + b1x + b2x2
Monocots versus dicots
Ficks Law of diffusion
D is the diffusion constant SI unit m2s-1