If to plant garlic annually on the same bed, then every year the harvest will please less and less. Exit only one - annually to change beds for sowing of culture, competently choosing predecessors to plant.
Each plant for growth and development needs certain set of nutrients and if on one bed to put culture, then during growth it ""will extend"" from soil practically all elements which are necessary specifically to it. If the next year to sow the same bed the same culture, then for receiving good harvest it is necessary will work much, will be not to do without fertilizing. However there are such plants which on ""tired bed"" even with use of fertilizers to grow up very difficult, for example, garlic - one of such cultures. Annually to receive excellent garlic bulbs, it is necessary to plant every year plant on new ""correct"" bed with suitable predecessors.
At once there is a wish to list cultures after which it is better not to plant garlic, these are onions, beet and potatoes. Onions belong besides to family, as garlic, both cultures need almost same nutrients, both have identical diseases, they are attacked by the same wreckers. That is the bed after onions is completely exhausted for such culture as garlic and it is impossible to be fully confident that soil in it is not infected, for example, with nematode. And potatoes and beet - cultures pozdnoubirayemy to prepare bed after them for garlic is quite problematic in the fall. And nutrients in soil after these plants remains not and much.
Now as for after what cultures, garlic can be planted and it is even desirable. So, ideal predecessors of garlic are ranoubirayemy plants, for example, red, Beijing, Bruxelles, Chinese and other species of cabbage, haricot (which term of maturing does not exceed 70-80 days), tomatoes, cucumbers. Cereals are also preferable predecessors of culture. Perfectly garlic grows also after various berries and also plants of family of pumpkin. And in general, for garlic it is better to think of bed in advance and at the beginning of summer to sow the small site of soil lucerne or clover that in the subsequent to use it for autumn sowing of garlic. Works will not take a lot of time, and the done work will be reflected in future harvest in the best way.
Well and finally It should be noted that the choice of bed for garlic is not limited only to selection of predecessors, it is important to consider composition of the ground also. It is better to bring sand or haydite in the heavy soil, as fertilizing for culture - humus. Winter garlic loves neutral soils therefore it is necessary ""to adjust"" before landing its acidity by entering of fertilizers into it.