EFFECTS OF CONTROLLED - RELEASE POTASH FERTILIZER ON GROWTH AND YIELD OF CUCUMBER IN THAI NGUYEN

Abstract

Received: 14/4/2021 Controlled-release fertilizers have been researched and used widely; hence, developing new slow or controlled-release fertilizers is very important. This study was conducted in the Winter-Spring crop of 2019 to evaluate the effects of controlled release potassium fertilizers on the growth, development and yield of Amata765 cucumber grown in Dong Hy district, Thai Nguyen province. The study was arranged in a complete randomized design with 04 treatments and 3 replications. Three controlled-release fertilizer formulations with different doses of 120 kg K2O/ha, 84 kg K2O/ha, and 60 kg K2O/ha were used to compare with the control formula using conventional fertilizer (120 kg K2O/ha). Research results show that the formula using controlled-release fertilizer with a dosage of 84 kg K2O/ha was suitable for the growth and development of cucumber plants in Dong Hy district, Thai Nguyen province. At this formula, even the time of plant growing was the longest (70 days), it still gave the highest figure in numbers of fruits/ plant (2.91), fruit length (20.13 cm), fruit diameter (4.16 cm), flesh thickness (1.36 cm), and the highest actual yield (19.81 tons/ha). Besides, with the rate of applying 84 kg controlled fertilizer/ha, plant have the best ability in resistance to pest and diseases. Revised: 20/5/2021