Survey on the effects of macro(N,P,K) and Micro elements (Fe, Zn, Mn) on quantitaive and qualilative characters of Khalili and Siah varieties of grapes
2004
Dorostkar, Moslem | Ghaib, Mohammad Nabi
To determine the effects of some macro and micronutrients on Siah and Khalili grape cultivars, an experiment was conducted at randomized complete block design (RCBD) with three replication and three years duration in Bavanat region. 11 fertilizer treatments were used at 4 times. The nutritional elements contained nitrogen, phosphorus, potassium, iron, zinc and manganese. The amount, time and source of fertilizer treatments included 150 gr. urea, 250 gr. potassium sulfate and super phosphate triple that used for each vine at March. 100 gr. of remained urea was applied at the second time of foliar application of micronutrients. Foliar application of iron, zinc and manganese sulfate was done at three times, two weeks before full bloom, three and six weeks after full bloom. In foliar application treatment, solution of 0.2, 0.4 and 0.6 percent were used for one, two and three nutritional elements respectively. The treatments contained control (without fertilizer) and 11 composition of 6 fertilizer elements. The results showed that the treatments of N+ P+ K+ Fe +Zn + Mn and N + P +K + Zn composition had the positive effects on yield components. Meanwhile, these treatments had no any negative effects on fruit quality and could be recommend for both cultivars. Total sugar and ash of the fruits had been affected by the treatments so that, the increasing of nutritional elements caused the reduction of totals sugar and induction of fruits ashes. There were significant difference between the effects of treatments on fruits acidity and total soluble solid in both cultivars but their trends were non clear.
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