The Thesis Entitled: EVALUATION OF APPLICATION METHODS OF COMPOST TEA AND FULVIC AND HUMIC ACIDS AND THEIR EFFECTS ON PLANT GROWTH

Abstract

The present work was conducted to: a) Evaluate the effect of application methods of (CT), (HA) and (FA) individually or in combination on potato growth and their yields. b) Evaluate the effect of compost tea (CT), or humic (HA) or fulvic (FA) acids individually or in combination with 50 or 100% of recommended mineral fertilizers on potato growth. To achieve the abovementioned objectives of this study, a field experiment (winter seasons of 2019) was conducted at El Nagah Village-Tahrir regions, Beheira Governorate, Egypt (Latitude 30º.40´N- Longitude 30º.33´E) (sandy soils represented newly reclaimed soil). The layout of the experiment was a split- plot design, with the main plots arranged in a randomized complete blocks design, with three replicates. Two different major crops were employed as test plants i.e., potatoes (Solanum tuberosum) and common bean (Phaseolus vulgaris), where the tested measurements may listed as follows: I)- For potato plants, fresh and dry weights of the growing plants (shoots), tuber yield per fed. " feddan=4200 m2") as well as quality traits of the tuber and their elemental composition were determined identically as done for common bean plants grown in sandy soils. II) For common bean plants, nodulation, fresh and dry weights of the growing plants (shoots and grains), grain and straw yields per fed, as well as quality traits of the seed and their elemental composition, mainly contents of nitrogen, phosphorus, potassium, copper, manganese and zinc of common bean plants grown in sandy soils were determined.. After 40 and 65 days from sowing, dry matter yields (DMY) of the growing plants (shoots), tuber yield per fed. " feddan=4200 m2"), as well as quality traits their elemental composition, mainly contents of nitrogen, phosphorus, potassium were determined. Three application methods of the used organic amendments were applying, these methods were: soil application (through drip irrigation "Drip"), foliar spray "Spray" and the alternative between them "Spray/Drip". The last application methods "Spray/Drip", half amount of each organic amendments were applying as soil application and the other 50% were applied as foliar spray). Control (without any applications of organic fertilizers) and three organic amendments i.e. CT, FA and HA were used in this study. The CT was prepared in the laboratory, then added at a rate of 200 L fed-1. Fulvic acid (FA) and HA were added at a rate of 6 and 10 Kg fed-1. respectively. The used mineral fertilizers (NPK) were applied at two rates (50 and 100% of recommended dose for the potato plants. The obtained results indicated that, the duple application "Spray/Drip" methods of organic amendments, considered as a more beneficial treatment in the cultivation of potato plants (Spunta cultivar) at newly reclaimed sandy soils due to it resulted in a high yield, quality and reducing the environmental pollution as a result from reducing the additions of the mineral fertilizer with the in combination organic amendments.

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