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Chemical and organic fertilizers in autumn barley on reddish-brown forest soil at Moara Domneasca



Chemical and organic fertilizers in autumn barley on reddish-brown forest soil at Moara Domneasca



Lucrari Stiint Inst Agron N Balcescu" Ser A 6: 85-91



Ammonium nitrate, superphosphate, potash and manure were used as fertilizers in Cenad 396 autumn barley. Fertilization at the rate of 40 or 70 kg/ha N resulted in yield increases of 396[long dash]427 kg/ha grain (16.9-18.2%) in the 1st case and 360-458 kg/ha (15.4-19.6%) in the 2nd, while per kg of active substance the increase was 9.9-10.6 kg grain with 40 kg/ha N decreasing to 5.1-6.5 kg grain with 70 kg/ha N. When, in addition to N, K and P were applied (70 kg/ha N + 60 kg/ha K2O or 40 kg/ha N + 80 kg/ha P2O5), the yield increase was 579 kg/ha (24.7%) and 557 kg/ha (23.8%), while per kg of active substance it decreased to 4.4 and 4.6 kg grain. When 70 kg/ha N + 80 kg/ha P2O5 + 80 kg/ha K2O were applied there was an increase of 824 kg/ha grain (35.2%) with an efficiency of 3.6 kg grain per kg active substance. When 20 t/ha manure + 70 kg/ha were applied the increase was as high as 844 kg/ha grain (36.1%) practically the same as that obtained by chemical fertilizing with N P K.

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