|Table of Contents|

Effect of increased planting density with reduced nitrogen application on grain filling characteristics and yield formation of tartary buckwheat(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2021 05
Page:
1334-1340
Research Field:
Articles
Publishing date:

Info

Title:
Effect of increased planting density with reduced nitrogen application on grain filling characteristics and yield formation of tartary buckwheat
Author(s):
ZHANG Yu LONG Mengqian HE Peiyun WU Xinghui HUANG Xiaoyan & HUANG Kaifeng?
Buckwheat Industry Technology Research Center, Guizhou Normal University, Guiyang 550001,China
Keywords:
Tartary buckwheat increased planting density with reduced nitrogen application grain filling characteristics endogenous hormone yield
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2020.05023
DocumentCode:

Abstract:
This study was carried out to clarify the effect of increased planting density with reduced nitrogen application on the grain filling characteristic and yield formation of Tartary buckwheat. Normal planting density with normal nitrogen application (CK, N 135 kg/hm2 and 1 000 000 plants/hm2, T1), normal nitrogen application with increased planting density (N 135 kg/hm2 and 1 200 000 plants/hm2, T2), reduced nitrogen application with normal planting density (N 108 kg/hm2 and 1 000 000 plants/hm2, T3), and reduced nitrogen application with increased planting density (N 108 kg/hm2 and 1 200 000 plants/hm2, T4) were tested with Jinqiao2 (JQ2), a Tartary buckwheat variety, as the experimental material. The effects on grain filling characteristics, endogenous hormone content and starch synthase enzymatic activity in grains, root morphology and physiology, antioxidant enzyme activity and malondialdehyde content in leaves, and agronomic characters and yield of Tartary buckwheat were studied. The results showed that compared with the control, increasing density and reducing nitrogen application could reduce the initial filling potential, maximum filling rate, and average filling rate of JQ2, and prolong the time taken to reach the maximum filling rate. The middle filling stage had the largest contribution rate to grain weight, followed by the later filling stage, and the smallest contribution was in the early filling stage. Abscisic acid (ABA) and indole-3-acetic acid (IAA) content; ADP-glucose pyrophosphorylase (AGPase), soluble starch synthase (SSS), and starch branching enzyme (SBE) activity in grains; root morphological index and root activity; superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activity in leaves of JQ2 increased first and then decreased with the advance of the growth period, and gibberellic acid (GA3) content decreased continuously with the advance of the growth period. Compared with the control, both increasing planting density and reducing nitrogen application treatment decreased starch, ABA, IAA content, AGPase, SSS, and SBE activity in the grain, and decreased root morphological index and root activity, SOD, POD and CAT activity in leaves of JQ2. The plant height, number of main stem nodes, number of branches of main stem, grain weight per plant, and 1000-grain weight of JQ2 were higher in normal planting density with normal nitrogen application treatment than in the other treatments. The grain number per plant and yield for density enhancement treatment (normal nitrogen application with increasing planting density treatment and reducing nitrogen application with increasing planting density treatment) was higher. The yields of the density enhancement treatments were 1.17 and 1.78 times higher than that of control and 1.46 and 1.47 times higher than that of T3 treatment. In summary, a suitable increase in planting density with reduced nitrogen application (reducing nitrogen application by 20% and increasing planting density by 20% in comparison with control) can increase the number of grains per plant and the final yield of Tartary buckwheat. We recommend this method for production to save fertilizer and produce a high yield of Tartary buckwheat.

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Last Update: 2021-10-25