Mona K. M. Abdel-Razek* ; Gehan H. Abel Aziz and Shreen S. Ahmed( 2019). The Influence of Applying some Stimulating Agents and Humic Acid on Productivity and Quality of Cassava Plants under Loamy Sandy SoilJ. of Soil Sciences and Agricultural Engineering, Mansoura Univ.,Vol 10 (10): 589 - 595 , 2019
Abstract: The effect of using some foliar spray stimulating agents (amino acids, potassium humate, micro-nutrients), as a spray application beside using humic acid and mineral fertilizers on yield and quality of Cassava plants (Indonesian, cv.) was studied. Moreover, the need for installation of drainage system was also investigated to maintain both soil salinity and water table in safe limits for plants. A field experiment was carried out at Al-Kassaseen Research Station – Ismailia Governorate, Egypt. The experiment was conducted during the two summer seasons 2017 and 2018. Mineral fertilizer was used as a recommended dose with or without humic acid and with or without foliar spray stimulating agents (amino acids, potassium humate, micro-nutrients).The experiment included eight treatments. The obtained results indicated that the maximum productivity of Cassava tubers was observed with the application of foliar spray stimulating agents and addition of mineral fertilizer with humic acid compared to control. The increasing in total yield of tuber fresh weights and dry matter% of Cassava plant had the following decreasing order: MHP>MHA>MHN>MP >MH>MN>MA> M. Moreover, a pronounced increase in tubers quality with (dry matter, starch, total sugar, crud protein and vitamin C) and nutrient contents (N, K, P, Zn, Mn, Fe and Cu) of Cassava tubers was noticed with the application of foliar spray stimulating agents under mineral fertilizer with humic acid compared to control.The results showed also a decrease in soil salinity compared with the control treatment (M) for different treatments of the study after harvesting Cassava plant according to the following order: MH>MHA or MHP > MHN >MP >MA >MN. The recommended calculated drain spacing in this area according to measured field data is 100 m spacing between drains and the recommended drain depth is 1.2 m.
Keywords: (humic acid, stimulation agents, dry matter, amino acid, potassium humate, tile drains .)
