الفهرس 
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Abstract
Effect of organo-chemical fertilizers mixtures under the condition of irrigation intervals with magnetized water on productivity of Jerusalem artichoke. This work was carried out at Sakha Horticultural Research Station, Farm, Kafr El-Sheikh governorate in North Middle Nile Delta, Egypt (31° 77’ N Latitude and 30° 57’ E Longitude with an elevation of about 6 meters above mean sea level ) during the two during the two growing seasons of 2017 and 2018 to study the impact of irrigation intervals, magnetized water, rates of organic and inorganic fertilizers and their interactions on vegetative growth aspects, nutrition status, yield and tubers properties of Jerusalem artichoke (Helianthus tuberosus L.). This experiment was carried out in a strip-split plot in complete randomized block design with three replications as follows: A-.Three irrigation intervals under furrow irrigation system were allocated in the vertical plots as shown in Table (1).: 1- Irrigation each 15 days (control) 2- Irrigation each 20 days (Moderate irrigation level) 3- Irrigation each 25 days (Deficit irrigation level) B-.Two types of irrigation water were allocated in the horizontal plots as follows: 1- Non- Magnetized water (Control) 2- Magnetized water. C- Rates of fertilizer sources were allocated to the split plots as shown in Table (2). Table (1): The quantity of irrigation water applied (m3/fed.) and numbers of irrigation (mean of two seasons). Irrigation Intervals (day) No. of irrigations Irrigation water applied (m3/fed / season) Each 15 days (control) 9 4159. Each 20 days 7 4013. Each 25 days 5 3861. Table (2): The experimental treatments of FYM and NK fertilizers mean of the two seasons. Rates of fertilizer sources Amount of fertilizers FYM. (m3/fed) Ammonium nitrate kg/fed Potassium sulphate kg/fed 100% NK Mineral 210.3 206 100% FYM (Organic) 20.2 - 75% NK+25% organic 5.1 157.7 154.1 50% NK +50% organic 10.2 105.1 103.0 25% NK + 75% organic 15.1 52.6 51.4. The obtained results could be summarized as follows: 5.1. As for the characteristics of vegetative growth, the results show that: Most vegetative growth characters of Jerusalem artichoke plants increased with irrigation treatment intervals every 15 and 20 days compared with the lowest values obtained by irrigation treatment every 25 days in both seasons Jerusalem artichoke plants, which irrigated with magnetized water gave the highest values of vegetative growth characters viz. plant height, plant fresh and dry weights, number of leaves, number of branches, leaf area and leaves total chlorophyll content compared to plants irrigated with normal water in both seasons. Jerusalem artichoke plants which fertilized with 50% organic + 50% mineral treatments gave the highest values of vegetative parameters followed by 25% organic + 75% mineral compared with the lowest ones caused by plants which were fertilized by 100% organic treatment in both seasons. Plants irrigated with magnetized water and watered every 15 and 20 days recorded the highest values of most vegetative growth parameters in both seasons. Jerusalem artichoke plants irrigated every 15 and 20 days and fertilized with 50% organic + 50% mineral gave the highest values of< vegetative growth parameters (plant height, plant fresh weight, plant dry weight, number of leaves/plant, number of branches/plant, leaf area /plant and leaves total chlorophyll content), compared with the lowest ones which were recorded by plants irrigated every 25 days and treated with 100% organic treatment in both seasons. Plants irrigated with magnetized water and fertilized with 50% organic + 50% mineral increased the vegetative growth parameters; plant height, plant fresh weight, plant dry weight, number of leaves/plant, number of branches/plant, leaf area /plant and leaves total chlorophyll content followed by Plants irrigated with magnetized water and fertilized with 25% organic + 75% mineral compared to the lowest values in this respect obtained by plants irrigated with normal irrigation water and fertilized with 100% organic treatment in both seasons. The highest values of most Jerusalem artichoke plants vegetative growth parameters were recorded by those irrigated with magnetized water every 15 and 20 days and fertilized by 50% organic + 50% mineral in both seasons. 5.2. As regards leaf mineral contents, the results show that: Leaf mineral contents; N, P and K were increased with moderate irrigation intervals every 20 days followed in decreasing ordered by irrigation interval every 15 and 25 days. Chemical constituents (N, P and K,) concentrations of Jerusalem artichoke leaves were increased when plants irrigated with magnetized water in both seasons. Application of 50% organic as FMY + 50% mineral fertilizer gave the highest values of N, P, K in leaves in both seasons. Combined interaction between magnetized irrigation water and irrigation every 20 days gave the highest percentage of N, P, K contents of leaves in both seasons. As for effect of the interaction between irrigation intervals and fertilizers sources, there were positive differences within the interactions as for N, P and K leaf content in both seasons. The applications of 50% organic plus 50% mineral from recommended dose and magnetized water gave the highest values of N, P and K of leaves in both seasons. The combination interaction among irrigation intervals every 20 days, magnetized irrigation water and application of 50% organic plus 50% mineral from recommended dose gave superiority values of N, P and K in both seasons. 5.3. Cconcerning yield and its components, the results show that: Yield and its components (number of tubers/plant, tuber weight/plant and tubers weight (ton/fed) positively affected by irrigation intervals (15, 20 and 25 days) treatments. The best results in this respect obtained from plants irrigated every 15 or 20 days in the both seasons. Jerusalem artichoke plants irrigated with magnetized water gave the highest yield and its components; number of tubers/plant, tuber weight/plant and tubers weight/fed. compared to the lowest ones in this respect resulted by control (non-magnetized) water in both seasons. The highest yield and its components viz., number of tubers/plant, tuber weight/plant and tubers weight/fed. were increased when Jerusalem artichoke plant fertilized by 50% organic + 50% mineral compared to the lowest values resulted in 100% organic fertilizer in both seasons. The highest values of tuber weight/plant and tubers yield (ton/fed) obtained from plants irrigated by magnetized water every 20 days followed by the treatment of magnetized irrigation water plus irrigation every15 days. On the other hand, the highest value of tubers number obtained from plants irrigated with magnetized water every 15 days in both seasons. Jerusalem artichoke plants fertilized by 50% organic + 50% mineral and watered every 15 days increased the tubers number /plant and every 20 days of both tuber weight/plant and tuber weight(ton/fed) in both seasons. The plants which were irrigated with magnetized irrigation water and fertilized with 50% mineral + 50% organic treatment gave the highest tuber yield and its component in both season. The highest values of tubers weight/plant and tuber weight/fed. were obtained from plants fertilized with 50% organic + 50% mineral and irrigated with magnetized water every 20 days in both seasons and number of tuber/plant in the first one only. 5.4. Regarding water use efficiency, the results show that: Water use efficiency increased with moderate irrigation intervals every 20 days followed in decreasing ordered by irrigation interval every 15 and 25 days in both seasons, respectively. Plants irrigated with magnetized water recorded the highest value of water use sufficiency compared with non-magnetized water in both seasons. Application of 50 % organic +50 % mineral fertilizer source gave the highest values water use efficiency followed by those fertilized with 25 % organic + 75% mineral in both seasons. Combined interaction between magnetized irrigation water and irrigation every 20 days gave the highest value of water use efficiency in both seasons. The applications of 50% organic + 50% mineral from recommended dose and irrigated every 20 days gave the highest values of water use efficiency in both seasons.. There were positive increment of water use efficiency between the interaction of 50% organic plus 50% mineral from recommended dose and irrigated with magnetized water in both seasons. The combination interaction among irrigation intervals every 20 days, magnetized irrigation water and application of 50% organic plus 50% mineral from recommended dose gave superiority values of water use efficiency in both seasons. 5.5. As for tubers quality, the results show that: TSS, firmness and inulin of Jerusalem artichoke tuber content positively influenced by irrigation every 25 and 20 days with non- differences among each of them, total carbohydrates every 20 days and vitamin C every 15 days in both seasons. Total carbohydrates, TSS, firmness, vitamin C and inulin of Jerusalem artichoke tuber were increased with irrigation by magnetized water treatment in both seasons. Jerusalem artichoke plants fertilized with 50% organic + 50% mineral gave the highest values of Total carbohydrates, TSS, firmness, vitamin C and inulin contents in tubers compared with other treatments in both seasons. Jerusalem artichoke plants watered with magnetized irrigation water every 20 days gave the highest values of total carbohydrates, TSS and inulin in both seasons, while the highest ones of firmness and vitamin C content recorded with non-magnetized water irrigated every 25 and 15 days, respectively in both seasons. The highest values of tuber total carbohydrates and inulin content were obtained from plants which were watered every 20 and fertilized with 50% organic + 50% mineral. However, both TSS and firmness and vitamin C gave the highest values of tuber from plants fertilized with 50% organic + 50% mineral from recommended dose and irrigated every 25 and 15 days in both seasons, respectively. The combination treatments between magnetized irrigation and fertilized with 50% mineral + 50% organic treatment regestreated the highest tuber total carbohydrates, TSS, firmness, vitamin C and inulin compared with the combination treatment of normal irrigation water and 100% mineral which recorded the lowest values in both seasons. Jerusalem artichoke plants irrigated with magnetized irrigation water every 20 days and fertilized by 50% mineral + 50% organic fertilizer recorded the highest digits of total carbohydrates, TSS, vitamin C and inulin in both seasons. On the other hand, the highest firmness value was obtained from tuber plants irrigated with non-magnetized water every 25 days and fertilized with 50% organic + 50% mineral fertilizer in both seasons. CONCLUSIO : In view of the obtained and discussed results, it was found that Jerusalem artichoke plants which fertilized by 50 % FYM + 50% NK (10.2 m3/fed FYM, 105.1 Kg/fed. ammonium nitrate and 103.0 Kg/fed. potassium sulphate) and irrigated with magnetized water every either 15 or 20 days ((9 irrigations (4159 m3/fed.) or 7 irrigation (4013 m3/fed.)) gave balanced vegetative growth, produced high tubers yield, and improved tubers quality. In addition, the irrigation every 20 days gave the highest value of water use efficiency (WUE) with saving irrigation water and to minimize soil pollution under the conditions of this study.