Organic fertilizers for supplying nutrients

This is the residue left after pressing the seeds of the castor oil plant. Castor oilmeal is mainly used as a nitrogen fertilizer and soil activator. The amounts used depend on the results of the analyses and the needs of the crops, and range from 800 to 1500 kg/ha. 

These oilmeals all still have a high oil content even after pressing the bulk fibre component is subsequently converted to humus. All these fertilizers are considered to be rich in nitrogen. 

These substances are also used as organic fertilizers. They are intended mainly for soil conditioning. They can also be used to improve composts in a natural way. 

MEAT MEALS AND BLOOD MEALS. Meat meals and blood meals are available in finely powdered form and are both fairly fast-acting high-quality organic nitrogen fertilizers (9 and 12% N, respectively). There are problems with dust development during application. These fertilizers should only be applied when there is no wind. In addition, during application of the fertilizers it is advisable to wear dust masks or use tractors with climatized cabins. Any fertilizer spreaders which can precisely distribute fertilizers in powder form are suitable for applying them. 

BONE MEALS. These are particularly suitable for supplying phosphorus and lime to the soil. Bone meals are produced from bone waste from abattoirs. Before grinding they are treated with hot steam and the fat is removed. The fat should not be removed with tetrachloromethane or similar toxic substances, however. If it is, the bone meal is not suitable for use on organic crops. 

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