Mixed green manure crops
There are a number of proprietary mixtures of seeds sold for green manuring. These are selected so that the plants provide a full balance of naturalnutrients and also fix nitrogen. One such mixture is broadcast at the rate of 30-60 g per sq m (1—2 oz per sq yd), and 1 kg (2.2 lb) is enough to cover 16.6 sq m (20 sq yd). It can be sown at any time, and should be dug under the when the plants are 15-23 cm (6-9”) tall. The nursery claims that it starts to provide nutrients two weeks after it has been dug in.
It is also possible to make up your own mixtures of seeds for green manuring. One such mixture, of grass seeds, with clover to provide nitrogen, can be sown in spring. It can be obtained from agricultural nurseries, and consists of four parts of timothy S.51 (the numbers refer to the particular strain of the plant), four parts of perennialS.23, two parts of cocksfoot S.143, two parts of rough-stalked meadowgrass, and one part of clover S.100.
Sow this mixture broadcast at the rate of 15-30 g per sq m (1/2—1 oz per sq yd), and as the grass grows, either cut it every 10 days, allowing theto fall onto the soil, or graze it with poultry, geese, sheep or goats.
During autumn, dig the grass into the soil after moistening it. If it was mown, you should add a nitrogenous fertilizer at the rate of 60 g per sq m (2 oz per sq yd) before digging it in. This is not necessary if it was grazed, as the grass will be much richer in nitrogen from the animals’ droppings.