Effect of foliar application of zinc, manganese and boron in combination with urea on the yield of sweet orange
2000
Perveen, S. | Hafeez-ur-Rehman (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Soil Sciences)
Foliar application of zinc, manganese and boron alone and in various combinations were applied to sweet orange trees @ 0.4, 0.2 and 0.04 kg in the presence of 1.56 kg N (urea) and 0.4 kg surf/ha dissolved in 400 litres of water. The main effects and interactions of foliar spray of Zn, Mn and B in factorial combinations were studied relative to micronutrient concentration in citrus leaves and fruit yield of sweet orange. Zinc significantly increased leaf Zn contents and fruit yield as compared to trees where Zn was not included in foliar spray. The highest yield of 105.3 kg/tree was obtained from trees sprayed with Zn alone. Application of Mn significantly increased leaf Mn content, fruit yield and intensified the red colour of skin and juice. Application of boron significantly increased total yield, but did not influence leaf boron content. On the basis of VCR and maximum net return 0.4 kg of Zn/ha in the presence of 1.56 kg of N/ha (urea) and surf 0.4 kg/ha is recommended for higher production of citrus and for curing the zinc deficiency in Peshawar valley.
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