NPK fertilization of dry and irrigated orchard grass (Dactylis glomerata L.)
1990
Banszki, T. (Agrartudomanyi Egyetem, Debrecen (Hungary))
The effect of 150, 300, 450 kg/ha N rates was studied on various growths of pure planted stands of orchard grass /Dactylis glomerata L./ in dry and irrigated experiments with basic PK fertilization of 50, 100 kg/ha on a chernozem soil well supplied with P and K. The NPK rates increased the dry matter yield to 13 t/ha in dry treatments and to 19 t/ha with irrigation. Sprinkler irrigation, when a total of 405 mm water was distributed over 9 occasions, had the greatest effect on the 2nd and 3rd growths, while fertilization had a greater effect on the 1st. Fertilization increased the N, K, Mg and Cu contents and reduced the P, Ca and Mn contents. Irrigation increased the P, K, Ca, Mn and Cu o/o, while moderating that of N. The N fertilizer was utilized to the greatest extent at a rate of 150 kg/ha under dry conditions and at 300 kg/ha with irrigation. Irrigation and rising N rates improved the utilization of P and K, too, with a particularly high quantity of K being extracted from the soil. Under the effect of fertilization there was little change in the P content of the soil, while the K supplies declined substantially.
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