Effects of nitrogen and phosphorus rates on growth and yield of LDH.09 peanut variety cultured on coastal sandy soil in Binh Dinh province

Abstract

This study determines the appropriate nitrogen and phosphorus rates to provide a high yield and efficiency for a new peanut variety cultured on coastal sandy soil in Binh Dinh province. The experiments consist of 12 fertilizer treatments with three levels of nitrogen fertilizer (30, 45 and 60 kg N·ha^–1), four levels of phosphorus fertilizer (70, 90, 110 and 130 kg P₂O₅·ha^–1), and a base of 10 tons of farm yard manure, 90 kg potassium, and 500 kg lime·ha^–1. The experiments were arranged in a split-plot design with three replications and conducted in the Summer-Autumn 2019 and Spring-Summer 2020. The traits, such as growth, yield, and economic efficiency, were studied. The results show that the treatment with 45 kg·ha^–1 of nitrogen and 110 kg·ha^–1 of phosphorus provides the highest yield (35.1 quintals·ha^–1 in the 2019 Summer-Autumn cropping and 41.3 quintals·ha^–1 in the 2020 Spring-Summer cropping), with the highest economic efficiency. The soil characteristics are also improved.