A further report is made of work on the fertilizer value of gülle for grassland. Organic N had an efficiency in grass production about 84% of that of inorganic N. The gülle used in this trial was particularly rich in available N and K. The abundance of K in gülle may require balancing with supplementary N in order to achieve efficient utilization of plant nutrients. Potassium/magnesium relationships in the nutrition of the grass plant are discussed.
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Herriott et al. (1963) studied this question.
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