Preliminary results on NPK nutrition of gladioli grown in solaria
1988
Roman, L. | Tepordei, R.
The paper presents some data on the NPK nutrition of gladioli crops - Oscar cultivar - planted under a high plastic tunnel and fertilized with different doses of chemical fertilizers. The authors have analysed the rhythm of accumulation of dry matter and rhythm of consumption of NPK/plant and have determined that, during the vegetation period (109 days to flower harvest), 100 plants have accumulated 4500 g dry matter, taking out from the soil 60 g N, 15 g P and 83 g K, in a N:P:K ratio of 4 : 1 : 5.6. During the vegetation period there are several moments of maximum accumulation of dry matter and of maximum consumption of NPK : for N, the period from the stage of 4-5 leaves to the formation of the flower buds (intensive development of leaf system, of the underground parts and of the flower stem), for P, the period of flower bud appearance and for K the period of intensive growth and development of the leaf system. The correlation between the curves of the dynamics of accumulations and NPK consumption by the plant and the curves of the dynamics of the nutrients in the soil (NPK - hydrosoluble forms) has shown that the best moments for fertilizer application are as follows: - for N - the stage of 1-2 leaves; - the stage of 3-4 leaves and formation of the roots of second degree; - the stage of 6-7 leaves and growth of the flower stem; - for P - tuberobulb plantation; - appearance of the flower buds; - for K - tuberobulb plantation; - the stage of 3-4 leaves and formation of the roots of second degree; - appearance of the flower buds
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