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Of all the essential nutrients , nitrogen ( N ) and phosphorus ( P ) are the two nutrients that most often limit the growth of primary producers . This means increasing the productivity and growth of both the farm and non farm economies . His current research is focused on the growth of silicon carbide epitaxial films for use in high power , high temperature and high voltage devices , as well as the growth of InGaSb for application in multi-IR technology . Claypans are hard when dry and very sticky and very plastic when wet and impede movement of water , air , and growth of plant roots . This marked a threshold in the growth of women 's studies in India .