The combined disciplines of agronomy, horticulture, plant pathology, entomology, plant breeding, and plant physiology. Agricultural engineering and agricultural economics are sometimes included in this term. Crop vulnerability
A crop is vulnerable if it is susceptible to a foreign parasite which is absent from the area in question. If the foreign parasite arrives in that area, the susceptibility is revealed, and the vulnerability is manifested. Potential damage then becomes actual damage. Some crop vulnerabilties are slight and unimportant. Others can be extreme, and the resulting damage can have major social and economic consequences. Thus the potato crops of Europe before 1845 were highly vulnerable to the blight fungus Phytophthora infestans. Note that a crop is vulnerable only if the parasite in question has epidemiological competence in the area concerned. Cross
In recurrent mass selection , a plant breeding cycle may involve several generations. The crossing generation is the one in which cross-pollination occurs. See also: single seed descent; late selection; family selection. Cross-pollination
Fertilisation with pollen coming from a different plant. When cross-pollination involves two genetically different plants, it leads to heterozygosity. See also: allogamy, outbreeder, self-pollination. Crotalaria juncea
Sunn hemp, which is cultivated throughout the tropics as a fast-growing green manure. It is also widely used in India as a fibre for sacking and cords, but it is inferior to true hemp (Cannabis).
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