Why is bone meal a good phosphate fertilizer? How to use it well?

Why do we say that bone meal is a good phosphate fertilizer? How to use the effect is good? Bone powder is made by crushing animal bones, and its main component is tricalcium phosphate, accounting for about 58%-62% of bone powder. In addition, it also contains 4% to 5% nitrogen and fat. In order to improve the application effect of bone meal, we should pay attention to the following four points:

① is suitable for use in acid soils. Generally, the dosage is 25 kilograms per 667m ², but it is often ineffective in calcareous soils.

② is mainly used in cruciferous crops, buckwheat, legume green manure and other crops, because these crops have high utilization rate and good effect on insoluble phosphorus in bone meal.

The fertilizer effect of ③ bone meal is slow, so it is suitable to be used as base fertilizer, especially concentrated strip application or hole application.

The fertilizer effect of ④ in summer is better than that in winter. When applying unfermented bone meal in the paddy field, it should be drained first and then applied to prevent the bone meal from floating on the water surface and affecting the fertilizer efficiency.

PS: bone tissue consists of a mixture of living cells and minerals (mainly calcium and phosphorus), which give bones solid physical properties. Bones come in different shapes and sizes, such as long bones in the arm, short bones in the wrist, flat bones in the sternum and skull, and irregular vertebrae. Adult bone is mainly made up of two kinds of tissue: hard dense bone on the outside and porous cancellous bone also known as spongy bone. The thigh bone, or femur, in the long bone is filled with fat called yellow bone marrow.

Annex 2: how to determine the "bone age"? What's the importance?

During growth, the cartilage layer near both ends of the long bone thinns at a predictable rate, eventually disappears, and the bone stops growing. With the help of X-ray examination, the thickness of growth plate can be determined and the bone age can be determined. Although the bone growth rate of each child is different, generally speaking, the bone age corresponds to the same age. If there is a big difference between bone age and age, it may be an endocrine disorder.