scholarly journals Effects of Planting Density on Yield and Canopy Structure of Erianthus Populations

2018 ◽  
Vol 87 (3) ◽  
pp. 259-260
Author(s):  
Keita Mizushima ◽  
Issei Kanai ◽  
Shigenori Morita
Keyword(s):  
Canopy Structure ◽  
Planting Density

scholarly journals Optimum Planting Density Improves Resource Use Efficiency and Yield Stability of Rainfed Maize in Semiarid Climate

2021 ◽  
Vol 12 ◽  
Author(s):  
Yuanhong Zhang ◽  
Zonggui Xu ◽  
Jun Li ◽  
Rui Wang
Keyword(s):  
Grain Yield ◽  
Resource Use ◽  
Photosynthetic Capacity ◽  
Canopy Structure ◽  
Crop Productivity ◽  
Yield Stability ◽  
Planting Density ◽  
Resource Use Efficiency ◽  
Semiarid Environments ◽  
Use Efficiency

Increasing planting density is an effective strategy for improving maize productivity, but grain yield does not increase linearly with the increase in plant density, especially in semiarid environments. However, how planting density regulates the integrated utilization of key input resources (i.e., radiation, water, and nutrients) to affect maize production is not clear. To evaluate the effects of planting density and cultivar on maize canopy structure, photosynthetic characteristics, yield, and resource use efficiency, we conducted a successive field experiment from 2013 to 2018 in Heyang County (Shaanxi Province, China) using three different cultivars [i.e., Yuyu22 (C1), Zhengdan958 (C2), and Xianyu335 (C3)] at four planting densities [i.e., 52,500 (D1), 67,500 (D2), 82,500 (D3), and 97,500 (D4) plants ha–1]. Increasing planting density significantly increased the leaf area index (LAI) and the amount of intercepted photosynthetically active radiation (IPAR), thereby promoting plant growth and crop productivity. However, increased planting density reduced plant photosynthetic capacity [net photosynthetic rate (Pn)], stomatal conductance (Gc), and leaf chlorophyll content. These alterations constitute key mechanisms underlying the decline in crop productivity and yield stability at high planting density. Although improved planting density increased IPAR, it did not promote higher resource use efficiency. Compared with the D1 treatment, the grain yield, precipitation use efficiency (PUE), radiation use efficiency (RUE), and nitrogen use efficiency (NUE) increased by 5.6–12.5%, 2.8–7.1%, and −2.1 to 1.6% in D2, D3, and D4 treatments, respectively. These showed that pursuing too high planting density is not a desirable strategy in the rainfed farming system of semiarid environments. In addition, density-tolerant cultivars (C2 and C3) showed better canopy structure and photosynthetic capacity and recorded higher yield stability and resource use efficiency. Together, these results suggest that growing density-tolerant cultivars at moderate planting density could serve as a promising approach for stabilizing grain yield and realizing the sustainable development of agriculture in semiarid regions.

scholarly journals STUDY ON THE EXPLAINABLE ABILITY BY USING AIRBORNE LIDAR IN STAND VALUE AND STAND COMPETITION

2016 ◽  
Vol XLI-B1 ◽  
pp. 19-23
Author(s):  
S. C. Huang ◽  
J. Y. Yeh ◽  
C. T. Chen ◽  
J. C. Chen
Keyword(s):  
Field Data ◽  
Forest Canopy ◽  
Canopy Structure ◽  
Three Dimensional ◽  
Airborne Lidar ◽  
Planting Density ◽  
Competition Index ◽  
Canopy Density ◽  
Characteristic Values ◽  
Stand Characteristics

Forest canopy structure is composed by the various species. Sun light is a main factor to affect the crown structures after tree competition. However, thinning operation is an appropriate way to control canopy density, which can adjust the competition conditions in the different crown structures. Recently, Airborne Light Detection and Ranging (LiDAR), has been established as a standard technology for high precision three dimensional forest data acquisition; it could get stand characteristics with three-dimensional information that had develop potential for the structure characteristics of forest canopy. The 65 years old, different planting density of <i>Cryptomeria japonica</i> experiment area was selected for this study in Nanytou, Taiwan. Use the LiDAR image to estimate LiDAR characteristic values by constructed CHM, voxel-based LiDAR, mu0ltiple echoes, and assess the accuracy of stand characteristics with intensity values and field data. The competition index was calculated with field data, and estimate competition index of LiDAR via multiple linear regression. The results showed that the highest accuracy with stand characteristics was stand high which estimate by LiDAR, its average accuracy of 91.03%. LiDAR raster grid size was 20 m × 20 m for the correlation was the best, however, the higher canopy density will reduce the accuracy of the LiDAR characteristic values to estimate the stand characteristics. The significantly affect canopy thickness and the degree of competition in different planting distances.

scholarly journals EFFECTS OF PLANTING DENSITY ON CANOPY PHOTOSYNTHESIS, CANOPY STRUCTURE AND YIELD FORMATION OF HIGH-YIELD COTTON IN XINJIANG, CHINA

2004 ◽  
Vol 28 (2) ◽  
pp. 164-171 ◽  
Author(s):  
ZHANG Wang-Feng ◽  
WANG Zhen-Lin ◽  
YU Song-Lie ◽  
LI Shao-Kun ◽  
FANG Jian ◽  
...  
Keyword(s):  
Canopy Structure ◽  
Planting Density ◽  
High Yield ◽  
Canopy Photosynthesis ◽  
Yield Formation

scholarly journals STUDY ON THE EXPLAINABLE ABILITY BY USING AIRBORNE LIDAR IN STAND VALUE AND STAND COMPETITION

2016 ◽  
Vol XLI-B1 ◽  
pp. 19-23
Author(s):  
S. C. Huang ◽  
J. Y. Yeh ◽  
C. T. Chen ◽  
J. C. Chen
Keyword(s):  
Field Data ◽  
Forest Canopy ◽  
Canopy Structure ◽  
Three Dimensional ◽  
Airborne Lidar ◽  
Planting Density ◽  
Competition Index ◽  
Canopy Density ◽  
Characteristic Values ◽  
Stand Characteristics

Forest canopy structure is composed by the various species. Sun light is a main factor to affect the crown structures after tree competition. However, thinning operation is an appropriate way to control canopy density, which can adjust the competition conditions in the different crown structures. Recently, Airborne Light Detection and Ranging (LiDAR), has been established as a standard technology for high precision three dimensional forest data acquisition; it could get stand characteristics with three-dimensional information that had develop potential for the structure characteristics of forest canopy. The 65 years old, different planting density of &lt;i&gt;Cryptomeria japonica&lt;/i&gt; experiment area was selected for this study in Nanytou, Taiwan. Use the LiDAR image to estimate LiDAR characteristic values by constructed CHM, voxel-based LiDAR, mu0ltiple echoes, and assess the accuracy of stand characteristics with intensity values and field data. The competition index was calculated with field data, and estimate competition index of LiDAR via multiple linear regression. The results showed that the highest accuracy with stand characteristics was stand high which estimate by LiDAR, its average accuracy of 91.03%. LiDAR raster grid size was 20 m × 20 m for the correlation was the best, however, the higher canopy density will reduce the accuracy of the LiDAR characteristic values to estimate the stand characteristics. The significantly affect canopy thickness and the degree of competition in different planting distances.

Proper planting density for direct seedling of 5 years old ginseng in rain shelter house

2019 ◽  
Author(s):  
YJ Yoon ◽  
KJ Lee ◽  
JH Yi ◽  
YM Mo ◽  
GW Lee ◽  
...  
Keyword(s):  
Planting Density

Growth and yield of okra (Abelmoschus esculentus (L.) Moench) grown in the marginal upland area of Sta. Rita, Samar as influenced by different planting densities and mulching materials

2017 ◽  
pp. 44-54
Author(s):  
Zenaida Gonzaga ◽  
Warren Obeda ◽  
Ana Linda Gorme ◽  
Jessie Rom ◽  
Oscar Abrantes ◽  
...  
Keyword(s):  
Bare Soil ◽  
Abelmoschus Esculentus ◽  
Growth And Yield ◽  
Planting Density ◽  
Rice Hull ◽  
Plastic Mulch ◽  
Lady’S Finger ◽  
Materials Used ◽  
Set Up ◽  
A Minor

Okra or Lady’s finger, botanically known as Abelmoschus esculentus (L.) Moench, is a tropical and sub-tropical indigenous vegetable crop commonly grown for its fibrous, slimy, and nutritious fruits and consumed by all classes of population. It has also several medicinal and economic values. Despite its many uses and potential value, its importance is under estimated, under-utilized, and considered a minor crop and little attention was paid to its improvement. The study was conducted to evaluate the effects of different planting densities and mulching materials on the growth and yield of okra grown in slightly sloping area in the marginal uplands in Sta. Rita, Samar, Philippines. A split-plot experiment was set up with planting density as main plot and the different mulching materials as the sub-plot which were: unmulched or bare soil, rice straw, rice hull, hagonoy and plastic mulch. Planting density did not significantly affect the growth and yield of okra. Regardless ofthe mulching materials used, mulched plants were taller and yielded higher compared to unmulched plants. Moreover, the use of plastic mulch resulted to the highest total fruit yield. The results indicate the potential of mulching in increasing yield and thus profitability of okra production under marginal upland conditions.

Canopy structure at the edge of seagrass affects sea urchin distribution

2013 ◽  
Vol 485 ◽  
pp. 47-55 ◽  
Author(s):  
S Pinna ◽  
N Sechi ◽  
G Ceccherelli
Keyword(s):  
Sea Urchin ◽  
Canopy Structure
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