Boron Deficiency in Cotton in Northern Nigeria I. Factors Influencing Occurrence and Methods of Correction

SUMMARY Boron deficiency in cotton occurs widely in northern Nigeria, where its extent and severity appear to be increasing, particularly under intensive agriculture. The deficiency may be aggravated by fertilizer application, specially nitrogen. Soil boron status varies greatly but is generally very low and often less than is considered necessary elsewhere. Superphosphate containing added boron corrects deficiency safely and satisfactorily.