THE EFFECT OF FERTILIZER REGIME ON SOIL HEALTH FOR GROWING TEA IN HOA LAC - THACH THAT, HANOI

Abstract

This paper presents the initial results of a trial of organic fertilizer combined with foliar fertilizer to restore soil health and increase the productivity of 33-year-old tea grown in the campus of Vietnam National University, in Hoa Lac - Thach That, Hanoi. The experiment was designed in a complete randomized block design with 3 replications in 3 treatments: (1) Control of people using chemical fertilizers; (2) Organic fertilizer and Organomix foliar fertilizer: water at a ratio of 1:500; (3) Organic fertilizer and Organomix foliar fertilizer: water at a ratio of 1:300. The soil in the trial was acidic, low exchange capacity, low humic and total nitrogen, and low available nutrients. The results after 1 year applying soil rehabilitation show that the amount of humic and total N tended to increase compared to the control. Due to the short time of measures, indicators such as pH, CEC, Ca²⁺, Mg²⁺, K and P availability in the soil have not changed. It is necessary to extend and maintain organic fertilizer application combined with balanced nutrition for plants such as foliar fertilizer to ensure sustainable production. Spraying foliar fertilizer at ratio of 1:300 Organomix: water gave higher yield than that at ratio of 1:500. The yield of treatment at ratio of 1:500 plus organic fertilizer increases tea yield by 6%, and up to 54% if combined with foliar fertilizer at a ratio of 1:300 compared to the control.