Vegetables crop rotation

How does the green manure fit into my crop rotation (See Vegetables, pp.230-233.)... 

Keeping to a strict rotation for vegetable crops (see also p.230) not only allows better use of nutrients, but also prevents the buildup of pests and pathogens in the soil. With perennial crops, such as roses, strawberries, apples, and pears, do not replant with the same species in the same place. New plants may fail to thrive due to high levels of host-specific pests or pathogens in the soil. The old established plants may have built up tolerance to these. 

Even if you are only growing a few vegetables to start with, it makes sense to draw up a simple plan for a crop rotation (see pp.230-233). Keep an eye on what happens through the season, so you can deal with any problems and adjust growing conditions accordingly. 

Perennial vegetables, which can stay in the same spot for many years, obviously do not fit into the usual crop rotation. 

What to do Ensure that land is well-drained. When growing vegetables, use a strict crop rotation. Control woundforming pests like wireworms, slugs, and root-damaging larvae. Once rot has started, there is no cure. Dispose of or bury infected plant material. 

Crop rotation is widely used to avoid pest problems and is practiced on approximately 80% of com and soybean acres, 87% of vegetable acres, 41% of cotton acres, and 65% of wheat acres. 

Less extravagant practices can also contribute to alleviating salinity. Introducing herbaceous perennials, mainly lucerne (Medicago sativa L.) into crop rotations has been shown to decrease soil water contents more effectively than traditional fallows of spontaneous vegetation (e.g. Angus et al. 2001, Bee and Laslett 2002). 

Prevention and Control Plant resistant cultivars. Using disease-free seeds and crop rotation may help prevent anthracnose diseases in vegetables. Copper sprays may provide some protection. Remove and destroy severely infected plants. 

Their most important application besides their use in maize culture is weed control in cereals, sugar cane, cotton, banana, pineapple, potato, sunflower and vegetable crops. Owing to their low persistence, which is favourable for crop rotation, their use is quickly becoming more widespread than the chloroamine triazines. 

To prevent a build-up of pests and diseases, practice crop rotation avoid growing vegetables from the same family in the same square for more than one year in three or four. 

Types of dark-brown or black granular muck have produced large quantities of vegetable crops and are often used for grain production and stock farming. Fertilizers, especially potash, can be used profitably. Rotations with oats and rye are common when the principal crops, such as onions, celery, and cabbage are threatened with insects and plant diseases. The production of reed and sedge peat and muck for soil improvement is of commercial importance in this area. 

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