Two field experiments were carried out during the two successive seasons of 2012/2013 and 2013/2014 at the Horticulture Research Farm of El-Bramoon, El-Dakahlia Governorate,, to investigate the response of globe artichoke plants cv. French, to foliar spray with seaweeds extract, chitozan levels and their combination on growth, earliness, quality, and productivity. The main results can be summarized as follows: 1). The results indicated that increasing seaweeds extract and chitozan levels individual or in combination were accompanied with significant increases in vegetative growth characters (plant height, number and dry weight of leaves/ plant) and yield distribution (early, medium and late yields) compared with control. 2). Application of seaweeds extract, chitozan levels and their combination improved most head quality characteristics (head weight, diameter, receptacle fresh and dry weight as well as TSS). However, there were no significant differences in terms of head length in the two seasons. 3) Dry receptacle N, P, K, protein and total sugars contents were positively and significantly responded to application of seaweeds extract, chitozan levels and their combination in the two seasons, while inulin was affected in the second season only. The combination between chitozan 2ml/Land seaweeds 2g/L as foliar application, seemed to be the most effective treatment, which gave a balanced vegetative growth, a higher early and total yield as well as a good quality. Moreover, this particular treatment combination was more beneficial compared to all other treatments.
Two field experiments were conducted on sweet potato (Ipomoea batatas L.) cv. Beaure Gard at the Horticulture Research Farm of El-Bramoon, El-Dakahlia Governorate, during the two successive summer seasons of 2007 and 2008 to evaluate the effects of different rates of phosphorus (15, 30 and 45 kg P2O5/fed) either single and/or in combination with application methods of humic acid (control, foliar spray, transplant treatment and soil application) on plant growth, yield and its components, as well as chemical constituents and storability of tuber roots. In general, results showed that the increasing of applied phosphorus rate from 15 kg P2O5 up to 45 kg P2O5/fed significantly increased main stem length, canopy dry weight plant leaf area, total chlorophyll and carotenoides as well as total and marketable yield, dry matter percentage of tuber root and tuber root weight and diameter, Moreover, Application phosphorus at 45 kg P2O5/fed significantly increased N, P, K, carbohydrate and total sugars in tuber roots. This P-rate had the most interesting observation was the enhancing of storability and reduced decay percentage. On the other hand, application methods of humic acid had a significant effect on all studied characters in both seasons. Soil application method of humic acid had a significant increases in plant growth characters, photosynthetic pigments, total and marketable yield and tuber root quality. Besides, this application method significantly increased chemical composition of tuber roots and reduced the weight loss and decay percentages. The combined treatments of P-rates and application method of humic acid were generally more effective on the most studied parameters than with single ones. The best results were obtained by application 30 kg P2O5/fed with soil application method of humic acid. This treatment achieved increases in vegetative growth characters, total and marketable yield, average of tuber root weight and diameter as well as concentrations of N, P, K, carbohydrate and total sugars in tuber roots. In addition, this combined treatment enhanced the tuberous roots storability and reduced decay% comparing with the other ones. Therefore, this treatment could be recommended for raising sweet potato yield and improving tuberous roots quality as well as reduced the need for chemical Pfertilizer by about 33.3 %, thereby reducing costs and environment pollution under similar conditions to this work.
The present investigation was carried out at El-Bramoon Experimental Farm, Hort. Res. Institute, Mansoura, Dakahlia Governorate, Egypt (+ 7m altitude, 30 o 11latitude and 28 o 26 longitude), during seasons of 2012 and 2013, to study the effect of slow release-N Sulfur coated urea "SCU" rats, and foliar spray with some micronutrients levels as well as their interaction on productivity, and quality of sweet potato cv. Abees. The most important finding could be summarized as follows: In general, results showed that the plants sprayed with mixture of micronutrients were better than those of the unsprayed ones. Increasing the foliar applied mixture of micronutrients concentration from 0 to 50 ppm significantly increase plant height, plant dry weight and leaves area/plant as well as total yield, marketable yield and weight, length and diameter. Moreover, foliar application of mixture of micronutrients significantly increased concentrations of N in the first season only. In addition, reducing sugar and carotene were increased in both seasons. Foliar spray with mixture of micronutrients at 50 ppm had the most interesting observation in the enhancing of most studied characters. On the other hand, application of slow release nitrogen fertilizers rates gave rise to significant increases in plant height, number of branches/plant; plant dry weight, leaves area/plant ratio, total yield, marketable yield and weight, length and diameter as well as chemical and organic constituents on tuber root of sweet potato. The application of 60 kgN/fed. sulfur coated urea "SCU", was superior on all studied characters. The combined treatments of sprayed with mixture of micronutrients and sulfur coated urea "SCU" were generally more effective on the most studied parameters than single ones. The best results were obtained by foliar sprayed with micronutrients at 50 ppm and application with 60 kg N/fed. sulfur coated urea "SCU" gave the highest values of plant growth, yield and its components as well as chemical and organic constituents in both seasons compared with the other treatments. Therefore, this treatment could be recommended for raising sweet potato productivity and quality under similar conditions to this work.
Two field experiments were conducted at Baramoon Research Station, Mansoura, Dakahlia Governorate, Egypt during the two successive seasons of 2011/12 and 2012/13, to study the effect of foliar spray with boron (25 and 50 ppm) or potassium (1000 and 2000 ppm) and their combination on earliness, yield and quality, chemical composition as well as seed yield of globe artichoke (Cynara scolymus L.) c.v green globe. The obtained results could be summarized as follows:- Early yield, total yield and head characters were significantly increased, in both seasons, in response to foliar spray with boron or potassium levels and there mixture. Foliar spray with 50 ppm B + 2000 ppm K significantly affect the concentration of N,P,K,total sugars and inulin of globe artichoke in both seasons of study. Number and weight of seeds /head as well as weight of100 seeds and germination percentage on different orders were positively and significantly responded to foliar spray with boron or potassium levels and their mixture in the two seasons. While, No significant difference was found between 50 ppm B + 2000 ppm K or 50 ppm B + 1000 ppm K. In general, most studied characteristics of the plants received foliar spray with boron and potassium were better than those of control. Increasing the rate of foliar spray with boron and /or potassium significantly increased early yield total yield, head characters ,chemical components and head position characters including number and weight of seeds/ head as well as weight of100 seeds and germination percentage.It could be stated that, foliar spray of globe artichoke with boron at 50 ppm and potassium at 1000 ppm is a promising practices for getting the highest seed yield and quality under local Egyptian conditions
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