Physiological maturity
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1. Crop is considered to be at physiological maturity when the translocation of photosynthates is stopped to economic part.
2. In other words, physiological maturity refers to a development stage after which no further increase in dry matter occurs in the economic part.
3. The attainment of physiological maturity can be seen from external symptoms like black-layer formation in sorghum and maize.
4. Bleaching of peduncle beneath the ear in some varieties of pearl millet.
5. Turning of green pods to brown colour in pulses.
6. Black– layer formation near sorghum grain attachment coincides closely with the cut-off of assimilate translocation.