Investigation on the effects of different amounts of macronutrients on quantitative and qualitative characteristics of Thomson navel sweet orange
2006
Shaikh Eshkevari, Alireza | Hayatbakhsh, Enayat | Moradi, Bizhan | Rafat, Farhad | Dadash Zadeh, Bahman | Ebrahimi, Yunos | Ma`sumi, Mas`ud | Bala Bandi, Mohammad Baqer | Najafi Hir, Kazem
Fertilizers can use for increasing the nutritional level of soil and so can applying for accelerate the bearing of plants and increasing the quantitative parameters of crop since fertilizers can affect the structure of soils, we should very carefully for applying these chemicals. Due to the lack of exact information about the need of Thomson navel sweet orange trees to Nitrogen, Potassium and Phosphorous we decided to perform a statistical experiment in Randomized Complete Block Design in two phases,in two stations(Kotra and Ramsar by rainfed and irrigated cultivationrespectively). In first phase vegetative parameters of trees such as trunk diameter, tree high, canopy volume was estimated. In this study treatments consists of 3 levels of sulfate(100,150,200 gr/tree), 4 levels of ammonium phosphate(0,25,50,75 gr/tree) and 4 levels of potassium sulfate (0,50,100,150 gr/tree) which was added according to age of trees and applied annually at near the end of February to middle parts of March. Ammonium sulfate was applied in two steps(one in March and another in May). The number of treatments and replications in this research are 48 and 5 respectively. And therefore 240 trees was analyzed in each year. We are forced to write in this place only about the interactions between elements which are used, because there are a great deal of topics for discussion. Obtained results of this experiment in 3 year were as follow: A) Vegetative growth: 1) Tree height: there are statistical difference between treatments in such a manner that N3P3K4 in either rainfed or irrigated plots was in class A. 2) Trunk diameter: there are statistical difference between treatments in such a manner that in rainfed plot N3P3K3 and in irrigated condition N3P4K1 was in class A. 3) Canopy volum of tree: there are statistical difference between treatments in such a manner that in rainfed plot N3P3K4 and in irrigated condition N3P3K3 was in class A. B) Reproductive growth: 1) Yield: there are statistical difference between treatments in such a manner that in rainfed condition N3P1K4 and in irrigated condition N3P1K3 was in class A. 2) Fruit peel thickness: there are statistical difference between treatments in such a manner that in rainfed plot N1P3K4 and in irrigated condition N2P2K4 was in class A.3) Fruit diameter: there are statistical difference between treatments in such a manner that N3P1K4 in either rainfed or irrigated plots was in class A.4) Fruit lenght: there are statistical difference between treatments in such a manner that in rainfed condition N1P2K1 and in irrigated plot N2P2K2 was in class A.5) Total soluble solids(TSS):there are statistical difference between treatments in such a manner that in rainfed plot N3P4K1 and in irrigated condition N3P2K3 was in class A.6) Titrable acidity(TA): there are statistical difference between treatments in such a manner that in rainfed plot N1P2K2 and in irrigated condition N2P1K3 was in class A.7) TSS/TA: there are statistical difference between treatments in such a manner that in rainfed plot N2P2K1 and in irrigated condition N3P2K2 was in class A.
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