Refers to the growing of specific crops for the purpose of digging them into the soil subsequently to rot down and act as manure. The main crops used in this way arelupins, vetches, mustard, rape and rye. For example, annul lupins can be sown at about ½ oz per sq. yd. from March to August.
They are dug in just before thebegin to flower. are particularly useful as they add to the nitrogenous reserves already present in the soil. Sulphate of ammonia or ‘Nitro-Chalk’ can be worked into the top inch or so of soil at the same time as this accelerates decomposition of the crop.