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close this bookBetter Farming Series 20 - Upland Rice (FAO - INADES, 1977, 30 p.)
close this folderUsing fertilizers
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View the documentWhy apply manure or chemical fertilizers?
View the documentWhat fertilizers to use
View the documentOrganic manure and chemical fertilizers

Why apply manure or chemical fertilizers?

28. To get a good harvest

It you apply manure or chemical fertilizers to your rice field, the rice will tiller vigorously (see paragraph 25) and bear many grains: The yield will be good.

29. To keep the soil rich

Chemical fertilizers give back to the soil the mineral salts which the plants take out. Manure gives the soil organic matter. It makes humus and improves the soil structure.

To keep the soil rich

30. Chemical fertilizers and manure cost a lot of money.

They will not pay

- if you grow your crop on too steep a elope the mineral salts of the manure and fertilizers are washed away by water together with the soil.

- if you do not till the soil well because in badly prepared soil the roots cannot develop well.

- if you do not sow selected varieties because unimproved varieties use the manure and fertilizers less well.

- if you do not sow your seeds in rows and at the right time because plants sown too late will not yield so well.

- if you do not cultivate about 3 weeks after sowing and whenever new weeds grow because with fertilizers, the weeds grow better. If you do not remove them often, they may take a large part of the nourishment from the rice.

- if you do not rotate your crops correctly

After 8 rice crop, the soil will still have some of the mineral salts added by the manure and the chemical fertilizers. You must make the right choice of the crop you will grow on the same field after the rice. If possible, choose one that will use the mineral salts still in the soil.

The money earned from a good crop will easily pay for the fertilizers you need.