EFFECTS OF PLANT DENSITY AND PHOSPHORUS ON GROWTH AND YIELD OF PEANUT VARIETY L29 IN SPRING CROP AT THANH HOA PROVINCE

Abstract

The studies were conducted to evaluate the effects of density and phosphorus fertilizer on the growth and yield of peanut variety L29 in the Spring 2024 - 2025 in Thanh Hoa province. Experiment 1 included 4 densities (25; 30; 35 and 40 plants/m²), experiment 2 included 5 phosphorus fertilizer doses (0; 60; 90; 120 and 150 kg P₂O₅/ha). The experiments were arranged according to the randomized complete block design (RCBD) with 3 replications. The results shown that when density increased, plant height and leaf area index tend to increasing. However, the dry biomass, yield components and yield tend to decreased when planting density increasing. The study shows that a planting density of 35 plants/m² allows peanuts to grow and develop well, giving the highest theoretical yield (3.78 tons/ha) and actual yield (3.26 tons/ha). The growth parameters, yield components and yield increased when the amount of phosphorus fertilizer increasing from 0 to 120 kg/ha. However, when the amount of phosphorus fertilizer continues to increase to 150 kg/ha, the growth parameters, yield components and yield tend to decrease. The fertilizer level of 120 kg P₂O₅/ha gives high values ​​for growth indexes and yield, especially the theoretical yield (4.59 tons/ha) and actual yield (3.75 tons/ha) reach the highest values.