IMPACT OF SHOOTS CUTTING TIMES AND THE FERTILIZER EQUATION ON GROWTH, PRODUCTIVITY, AND CHEMICAL COMPONENTS OF JERUSALEM ARTICHOKE

Abstract

Two field experiments were conducted to study the effect of two shoots cutting times, and four fertilizer equations on growth, yield and chemical components. These trials were carried out during the two successive growing seasons of 2009 and 2010 at Kaha Research Farm, Kaluobia Governorate Egypt. Jerusalem artichoke (Helianthus tuberoses L) 'Fuseau' cultivar was used for studying the effect of different cutting times (at 60 and 90 days and control, i.e., without cutting) and four fertilizer equations (FE1) 200 kg/fed. of Calcium super phosphate (15.5%P2O5) was applied once before planting during soil preparation,+{250 kg/fed. of Ammonium sulphate (20.5%N) + 200 Kg/fed. of Potassium sulphate (48%k2O)} both were added as two equal doses after 30 and 60 days after planting (control treatment). Fertilizer equation (FE2) 100 kg/fed. of Calcium super phosphate was applied once before planting during soil preparation,+{250 kg/fed. of Ammonium sulphate + 200 Kg /fed. of Potassium sulphate was added as two equal doses after every cutting times (60 and 90 days after planting) and the remaining of 100 kg/fed. of Calcium super phosphate was applied at 120 days after planting. Fertilizer equation (FE3) 100 kg/fed. of Calcium super phosphate was applied once before planting during soil preparation, + 30% of quantity from {250 kg/fed. of Ammonium sulphate + 200 Kg/fed. of Potassium sulphate was added at 30 days after planting, as for the 70% that retained it has been added after each cutting times (every 60 and 90 days after planting) and the remaining of 100 kg/fed. of Calcium super phosphate was applied at 120 days after planting Fertilizer equation (FE4) 100 kg/fed. of Calcium super phosphate was applied once before planting during soil preparation, + 50% of quantity from {250 kg/fed. of Ammonium sulphate (20.5%N) + 200 Kg /fed. of Potassium sulphate were added at 30 days after planting, as for the 50% that retained have been added after each cutting times (at 60 and 90 days after planting) and the remaining of 100 kg/fed. of Calcium super phosphate was applied at 120 days after planting. . A split plot design was used. Obtained results indicated that control plants produced the greatest vegetative growth, yield and its components and chemical constituents compared with other treatments. As regard to the effect of fertilizer equations, plants fertilized with equation 2 produced the maximum growth and yield and its components. On the other hand, the fertilizer equation 4 gave the highest values in total and reducing sugar content in tubers.Concerning the interaction between cutting times and fertilizer equations, data indicated that plants which cut at 60 days after planting with added fertilizer equation 2or 4 produced maximum values in yield and its components.It can be recommended that plants with cutting at 60 days after planting and applied the fertilizer equations 2 or 4 gave the highest values in the most parameters in this study.

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