Algan, Duygu Ondokuz Mayıs University - Faculty of Agriculture - Field Crops Department, Turkey , Aydın, İbrahim Ondokuz Mayıs University - Faculty of Agriculture - Field Crops Department, Turkey

Changes in nitrate (NO3-N) and macro mineral content of different forage sources affected by increasing nitrogen doses

33915

Nitrate toxicity due to excessive nitrogen (N) fertilization in forage crops is one of the most importantnutritional concerns. The aims of this study were to evaluate the effects of increasing rates of N fertilizer on the NO3-N content and K/(Ca+Mg) ratio of some forage crops such as pasture (Experiment 1) (Exp 1),vetch (Vicia pannonica Crantz.) and barley (Hordeum vulgare L.) mixture (2/1, Exp 2) and corn (Zea mays L.) (Exp 3) and the effect of silage on the NO3-N contents of forage corn (Exp 4). These experiments, except for Exp 4 were carried out under dryland field conditions by applying increasingrates of N (0, 50, 100, 150 and 200 kg ha^-1) in a randomized plot with three replicates. Dry matter yield, crude protein and some mineral (calcium (Ca), phosphorus (P), potassium (K) and magnesium (Mg))contents and ratio amoung some minerals and NO3-N content of forage from each experiments weredetermined. The results showed that the NO3-N contents and K/(Ca+Mg) ratio of the forages increased up to toxic levels in accordance with increasing rates of N fertilizer independing of type of forage.

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Concentration , Forages , Macro mineral , Nitrate accumulation , Nitrite , Quality

Anadolu Journal Of Agricultural Sciences

168