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- W2076737809 abstract "Abstract The interrelationships and use of a series of general concepts in modelling plant nutrition and growth are exemplified with laboratory and field experiments with steady state nutrition and growth mainly of forest tree species. It follows from mathematical derivations that in order to maintain a constant nutrient concentration in the plant, the relative uptake rate, R U , and therefore the relative addition rate, R A , must equal the relative growth rate, R G . A concept corresponding to R A has been introduced to specify the rate of nutrient supply under field conditions, the nutrient flux density, D n . The ability of the plant to take up the nutrients made available is expressed in the concept of utilization capacity, U n . The experimental results suggest that plant nutrient requirements can be defined by two variables: complete nutrient proportions in plant and fertilizer and rate of application of fertilizer to support current growth. Experiments with tree seedlings grown with different R A 's resulted in very stable internal nutrient concentrations. The nutrition/growth relationships were in good agreement with theory but very different from traditional textbook principles; the value of R G , up to a maximum, followed very closely the value of R A , independent of the external concentrations of nutrients, and the growth rate was proportional to the amount of nutrient in the plant. The proportionality parameter expresses the nutrient productivity, P n , a concept which has been found to be widely useful. From these relationships it follows that growth does not show a diminishing return with an increased nutrient supply, as indicated by the Mitscherlich curve, and that optimum nutrient status is identified as a discrete value rather than as a concentration range. The production increase in the forest field trials was very large and far exceeded expected potentials. There are indications that the use of repeated, small fertilizations may result in increased soil fertility for a long period of time." @default.
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- W2076737809 date "1987-10-01" @default.
- W2076737809 modified "2023-09-27" @default.
- W2076737809 title "New concepts on soil fertility and plant nutrition as illustrated by research on forest trees and stands" @default.
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- W2076737809 doi "https://doi.org/10.1016/0016-7061(87)90035-8" @default.
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