Because of the high cost of developing and registering new agrochemicals, plant growth regulators, hitherto small speciality crop-management aids, can now only be seen to have a commercial future in the larger markets such as are provided by ‘broad-acre’ arable crops. Temperate cereals can be manipulated at various growth stages. Existing chemicals control lodging; as yet undiscovered ones may lead to advantageous distribution of nutrients in favour of grain formation.
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