Fatma H. El-Agazy; Seham M. Abdel-Azeem and Mohsen S. Mahrous( 2019). Effect of TRYPTOPHAN, COMPOST TEA and POTASSIUM HUMATE on SANDY SOIL FERTILITY and LUPINE (Lupinus polyphyllus, cv. GIZA 2) PRODUCTIVITY. Egypt. J. of Appl. Sci., 34 (1) 2019 1-20
Abstract: A field experiment was conducted in sandy soil in Ismailia Agric. Res. Station, Ismailia Governorate, Egypt, during two successive winter 2016/2017 and 2017/2018 seasons cultivated with lupine. The aim of this study was to evaluate the effect of three treatments (potassium humate, compost tea and tryptophan) at different rates of (0, 2, 4 and 6 ml/L water) with two application methods (soaking and foliar application) on loamy sand soil fertility and lupine (Lupinus polyphyllus, cv. Giza 2) productivity. In both seasons, each experiment was carried out in randomized complete blocks design with six replicates. Results indicated that the highest mean values of all growth parameters plants i.e. (plant height (cm), No. of leaves/plant, No. of pods/plant, pods weight (g)/plant, seeds yield (ton/fed), straw yield (ton/fed) and weight of 100 seed (g) were treated with tryptophan foliar application than all treatments. The N concentration in seeds of lupine with increasing rates all foliar application treatments was increased significantly, while P concentration was significant as plant treated with foliar and soaking methods of all treatments, compared K potassium concentration was no significant as affected with foliar or soaking methods. The highest mean values of protein (%) 30.47 % and protein yield 341.30 (kg/fed) contents in seeds lupine treated with foliar application for tryptophan than all treatments. The highest mean values of Fe, Mn and Zn concentrations in seeds of lupine plants were 74.51, 106.64 and 40.27 mg kg-1 respectively in seeds soaking method and 77.56; 111.42 and 42.07 mg kg-1 for seeds foliar method respectively for plants treated with tryptophan compared with other treatments. The lowest value of soil pH 7.87 was obtained in the soil treated with foliar application of compost tea at 6 ml/L compared with other treatments. Also, the used of potassium humate, compost tea and tryptophan foliar application was significant decrease of soil salinity (EC dSm-1), while soaking method was no significant for decrease soil salinity. The different rates of all treatments soaking method to soil gave significant increase of N and P available contents in soil while the foliar application was no significant. As well as, the K available in soil treated with all rates of treatments led to significant for soaking. The highest mean values of Fe, Mn and Zn contents in soil treated with foliar application of compost tea. Recommendation: the used tryptophan foliar application on lupine plants was superior to increase the improved grown lupine plants in sandy soil, while the used of compost tea led to improve loamy sand soil.
Keywords: (loamy sand soil properties, potassium humate, tryptophan, compost tea soaking and foliar application, lupine productivity.)
