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However, it takes time to break these down and it's hard to predict the amount of nutrients available for the crop and when it will become available. If you are using organic fertilizers such as manure it can have a variable nutrient content which might change over time. It helps provide nutrients during critical growth stages.
By ‘lack of humus’ he is referring to the increasing trend, even then, to dispense with returning organic matter to the soil, for example, in the form of composted farmyard manure, that was made possible by the development of synthetic fertilisers.
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