Effects of Nitrogen Application on the Growth and Yield of Quinoa under Saline Conditions in Northern Vietnam

Dang Thi Phuong Anh,Dinh Thai Hoang,Luu Hue Nhan,Nguyen Viet Long

doi:10.31817/vjas.2021.4.1.01

Abstract

This study aimed to determine the optimum nitrogen application rate for quinoa in saline soils. Two experiments were conducted: (i) the first experiment was under artificial saline conditions with the two factors of saline regime (stressed and non-stressed) and nitrogen application level (0, 30, 60, 90 and 150 kg N ha-1) in net-houses located in Gia Lam, Hanoi; and (ii) the second experiment was under natural field saline conditions with the two factors of quinoa cultivar (Atlas and Moradas) and nitrogen application level (0, 30, 60, 90, and 150 kg N ha-1) in the coastal areas of Hai Hau, Nam Dinh province. Data were collected for growth duration, insect and disease infestations during the growth period, and various growth parameters and yield components at harvest. The results showed that saline stress reduced the growth and yield parameters, but did not affect the quinoa growth duration of the investigated quinoa cultivars. In both experiments, the growth parameters and yield components increased according to the increase of the nitrogen application rates from 0 to 90 kg N ha-1, then decreased when the nitrogen rates were higher. The results suggested that 90 kg N ha-1 was the optimum nitrogen application dose for quinoa growth and development under saline soil conditions.

Highlights

Over one million hectares of cultivated land in the coastal cities in the two major rice and fruit tree areas, the Red River Delta and the Mekong River Delta, in Vietnam are covered by saline soil (Nguyen Van Dao & Ho Quang Duc, 2019)
Applying nitrogen extended the total growth duration of quinoa from 4.0 to 7.8 days compared to the 0 kg N ha-1 treatment
The results indicated that the growth duration of both quinoa varieties was extended, but just in the treatments of high nitrogen application doses of 90 and 150 kg N ha-1

Summary

Introduction

Over one million hectares of cultivated land in the coastal cities in the two major rice and fruit tree areas, the Red River Delta and the Mekong River Delta, in Vietnam are covered by saline soil (Nguyen Van Dao & Ho Quang Duc, 2019). In these areas, the production of traditional crops is under the effect of salt and drought stress with low and unstable yield, and high input costs from. It is considered a functional food that helps prevent heart disease and improves bone health (FAO, 2013)

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Conclusion