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Abstract Three types of stability of real matrices are compared and necessary conditions are obtained in terms of the principal submatrices. For normal matrices and matrices whose off-diagonal… Continue Reading
A simple necessary and sufficient condition is given for the existence of a square root of an × complex matrix A. The condition is defined by the dimensions of the nullspaces of Ak, k = 0,1, 2,….
Abstract Growth curves from two sources of nitrogen at levels ranging from 0 kg N to 240 kg N/ha indicated DM yields of 2 000 kg/ha to 13 000 kg/ha from Pennisetum clandestinum at various localities… Continue Reading
In a series of experiments designed to test the use and efficiency of paraquat (when applied as Gramoxone) in controlling the growth of veld grasses in the Ngongoni Sourveld, it was shown that when… Continue Reading
Abstract Sown pastures of Paspalum dilatatum (and other species) in Natal are subject to degradation by Eragrostis plana (mshiki) invasion. The ratio between these two grasses, growing together in… Continue Reading
The amount of milk which can be produced by cows grazing Pennisetum clandestinum (kikuyu) is dependant on several management factors. These factors relate to the nutritive value and intake of the… Continue Reading