Which of the following practices for growing crops is not part of crop rotation method?
(A) Crops requiring more water are grown before crops requiring less water.
(B) Crops requiring more fertilizers are grown before crops requiring less fertilizers.
(C) Deep rooted crop is grown after smaller rooted crops.
(D) Leguminous crop is grown between two grain crops.
Answers
Explanation:
The importance of crop rotation
Proper crop rotation is essential for growing fibre flax in accordance with the requirements of sustainable agriculture (Raymond et al, 2010), which focus on limiting environmental costs (mineral fertilizers, crop protection chemicals) as well as economic and energy costs (Zika-Prandl, 2008). A good forecrop reduces the need for mineral fertilizers and pesticides, and is crucial to reducing of the number of tillage treatments. The right forecrop can decrease the costs of flax cultivation in terms of energy and money (Sultana, 1983). In Europe, cereals make good forecrops for flax, especially oats, which accelerate the process of soil self-cleaning from Fusarium wilt. Another good choice is root crops, which leave the soil clean, free of weeds, and with good structure. Potatoes are especially suitable, because they do not use up too many nutrients or too much moisture, and also limit the occurrence of Fusarium wilt. Potato crops are harvested early, allowing for good soil preparation in autumn. Beets, due to their long tap roots, loosen deeper layers of the soil and so allow flax to form stronger root systems. However, in dry conditions this can be a disadvantage, because beets use up moisture from deeper layers of the soil, leaving insufficient water for flax cultivation.
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