The pulse crops in general give lower yields than the cereals. Pulses are rich in protein and it takes more energy weight for weight to synthesise protein than carbohydrates. When you compare the energy requirement of various metabolic pathways. one gram of glucose can give rise to 0.8g of carbohydrate but on an average only about 0.5 g protein and even less of oil. The protein from pulses are incomplete. Legumes are good source of lysine, tryptophan and theonine but are low in suphur containing amino acids methionine, cystine and cystene which are adequate in cereals. So a mixture of cereals and pulses are recommended for food. Many grain legumes contain toxic inhibitors which are removed while cooking.
Further
maintenance of nitrogen fixation in roots require prolonged use of
photosynthate and thus may reduce the energy available for storage in seeds.
Main reasons for
low yield compared to cereals
1. Indeterminate
growth habit
2. Long continued natural selection
3. Cultivation on poor soils
4. Inadequate use of fertilizers
5. Inadequate plant protection
measures
6. Rainfed cultivation
7. Photo sensitiveness
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