Using of some bio and organic fertilizers to reduce the rate of mineral N fertilization and improving orange tree production
2009
Abdel-Salam, Y.G. | Nomier, S.A. | Al-Ashkar, R.A.
In a field experiment during the two successive seasons of 2004 and 2005, mature fruiting Washington navel orange trees were subjected to flood irrigation system and received ten different combinations of mineral nitrogen (MN), organic nitrogen (ON) and biofertilizers (Bio). Control trees received 1kg MN without bio or organic fertilizers. Other combinations were: 1.0, 0.75, 0.50 kg mineral N with or without organic or biofertilizers (Biogein or Effective Microorganisms (EM). The obtained results revealed that the combination of 1 kg MN with organic or hiofertilizers increased total yield, fruit set, fruit retention, number of fruit/tree, fruit weight, pulp fresh weight and leaf N (%). Moreover, these combinations decreased flower drop primary fruitlet drop (%) and June drop, preharvest drop and peel fresh weight. As a conclusion, the best results with regard to the yield and fruit quality were obtained by fertilizing the trees with 1 kg mineral N/tree with biofertilizers (Biogein or EM) or organic fertilizer. On the other side, treatment of 0.75 kg mineral N/tree with Biogein minimizing rate mineral N fertilization was nearly as efficient as the control and no significant differences between them on fruit set percentages, fruit retention, number of fruits / tree, fruit weight, total yield/tree and leaf N percentage.
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