This tropical pulse, a member of the family Leguminoseae, is called the pigeon pea, also known as red gram, Congo pea, and no-eye pea, and it is a native of Africa This crop is self-pollinating with about 20% of out-crossing, usually by bees and other insects. For controlled hybridisation, the flowers must be emasculated before 9.00 a.m., on the day before the flower opens. They may be hand-pollinated at the time of emasculation. Pigeon peas have a wide ecological adaptability but they do poorly in the wet tropics and they cannot tolerate frost. Most cultivars are short-day plants. This is a suitable crop for amateur breeders who should usually begin by selecting within local landraces. Calabash
See: Crescentia cujete. Calabrese
See: Brassica oleracea var. italica. Calcium
Calcium is an essential nutrient of plants, and it ranks in importance after nitrogen, phosphate, and potash. Using lime (calcium carbonate) as a fertiliser both adds calcium and lowers the acidity (see pH) of the soil.
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