scholarly journals Assessing the Self-Recovery Ability of Maize after Lodging Using UAV-LiDAR Data

2021 ◽  
Vol 13 (12) ◽  
pp. 2270
Author(s):  
Xueqian Hu ◽  
Lin Sun ◽  
Xiaohe Gu ◽  
Qian Sun ◽  
Zhonghui Wei ◽  
...  
Keyword(s):  
Reduction Rate ◽  
Canopy Height ◽  
The Self ◽  
Yield Reduction ◽  
Lidar Data ◽  
Growth Stages ◽  
Loss Assessment ◽  
Filling Stage ◽  
Maize Plants ◽  
Different Growth Stages

Lodging is one of the main problems in maize production. Assessing the self-recovery ability of maize plants after lodging at different growth stages is of great significance for yield loss assessment and agricultural insurance claims. The objective of this study was to quantitatively analyse the effects of different growth stages and lodging severity on the self-recovery ability of maize plants using UAV-LiDAR data. The multi-temporal point cloud data obtained by the RIEGL VUX-1 laser scanner were used to construct the canopy height model of the lodging maize. Then the estimated canopy heights of the maize at different growth stages and lodging severity were obtained. The measured values were used to verify the accuracy of the canopy height estimation and to invert the corresponding lodging angle. After verifying the accuracy of the canopy height, the accuracy parameter of the tasselling stage was R2 = 0.9824, root mean square error (RMSE) = 0.0613 m, and nRMSE = 3.745%. That of the filling stage was R2 = 0.9470, RMSE = 0.1294 m, and nRMSE = 9.889%, which showed that the UAV-LiDAR could accurately estimate the height of the maize canopy. By comparing the yield, canopy height, and lodging angle of maize, it was found that the self-recovery ability of maize at the tasselling stage was stronger than that at the filling stage, but the yield reduction rate was 14.16~26.37% higher than that at the filling stage. The more serious the damage of the lodging is to the roots and support structure of the maize plant, the weaker is the self-recovery ability. Therefore, the self-recovery ability of the stem tilt was the strongest, while that of root lodging and root stem folding was the weakest. The results showed that the UAV-LiDAR could effectively assess the self-recovery ability of maize after lodging.

scholarly journals Analysis of Plant Height Changes of Lodged Maize Using UAV-LiDAR Data

Agriculture ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 146 ◽  
Author(s):  
Longfei Zhou ◽  
Xiaohe Gu ◽  
Shu Cheng ◽  
Guijun Yang ◽  
Meiyan Shu ◽  
...  
Keyword(s):  
Plant Height ◽  
Maize Yield ◽  
Canopy Height ◽  
Estimation Accuracy ◽  
Yield Reduction ◽  
Lidar Data ◽  
Height Estimation ◽  
Aerial Vehicle ◽  
Yield Quality ◽  
Maize Plants

Lodging stress seriously affects the yield, quality, and mechanical harvesting of maize, and is a major natural disaster causing maize yield reduction. The aim of this study was to obtain light detection and ranging (LiDAR) data of lodged maize using an unmanned aerial vehicle (UAV) equipped with a RIEGL VUX-1UAV sensor to analyze changes in the vertical structure of maize plants with different degrees of lodging, and thus to use plant height to quantitatively study maize lodging. Based on the UAV-LiDAR data, the height of the maize canopy was retrieved using a canopy height model to determine the height of the lodged maize canopy at different times. The profiles were analyzed to assess changes in maize plant height with different degrees of lodging. The differences in plant height growth of maize with different degrees of lodging were evaluated to determine the plant height recovery ability of maize with different degrees of lodging. Furthermore, the correlation between plant heights measured on the ground and LiDAR-estimated plant heights was used to verify the accuracy of plant height estimation. The results show that UAV-LiDAR data can be used to achieve maize canopy height estimation, with plant height estimation accuracy parameters of R2 = 0.964, RMSE = 0.127, and nRMSE = 7.449%. Thus, it can reflect changes of plant height of lodging maize and the recovery ability of plant height of different lodging types. Plant height can be used to quantitatively evaluate the lodging degree of maize. Studies have shown that the use of UAV-LiDAR data can effectively estimate plant heights and confirm the feasibility of LiDAR data in crop lodging monitoring.

Response of Chickpea Cultivars to Imidazolinone Herbicide Applied at Different Growth Stages

2016 ◽  
Vol 30 (3) ◽  
pp. 664-676 ◽  
Author(s):  
M. Laura Jefferies ◽  
Christian J. Willenborg ◽  
Bunyamin Tar'an
Keyword(s):  
Great Plains ◽  
Growth Stage ◽  
Field Experiments ◽  
Northern Great Plains ◽  
Yield Reduction ◽  
Growth Stages ◽  
Resistant Cultivars ◽  
Node Development ◽  
Different Growth Stages ◽  
Chickpea Cultivars

POST broadleaf weed control options in chickpea are very limited on the Northern Great Plains. Field experiments were conducted in 2012 and 2013 in Saskatchewan to evaluate the response of chickpea cultivars to imidazolinone (IMI) herbicides applied at different growth stages. Conventional cultivars ‘CDC Luna’ and ‘CDC Corinne’ were compared with IMI-resistant cultivars ‘CDC Alma’ and ‘CDC Cory’. Treatments comprised a combination of imazethapyr + imazamox herbicides at 30 and 60 g ai ha−1(1× and 2× rates, respectively) applied at the 2 to 4-, 5 to 8-, and 9 to 12-node growth stages. Visual injury estimates were > 50% for CDC Luna and CDC Corinne for all growth stage applications. Conventional cultivars also experienced height reduction and decreased rate of node development compared with the nontreated controls. Flowering and maturity of CDC Luna and CDC Corinne were delayed for herbicide applications at all growth stages; however, application at the 9 to 12-node stage caused the most severe delay. All treatments of IMI herbicide caused yield reduction in the conventional cultivars in 2013. In contrast, IMI-resistant cultivars CDC Alma and CDC Cory demonstrated no negative response at any growth stage of IMI herbicide application. Visual injury estimates were negligible, and height, node development, days to flowering, maturity, and yield did not differ significantly between IMI-treated plants and the respective controls. These results demonstrated the potential of in-crop use of IMI herbicide on resistant chickpea cultivars to control broadleaf weeds.

scholarly journals Improvement of Salt Tolerance in Maize by Exogenous Application of Proline

2015 ◽  
Vol 8 (1) ◽  
pp. 13-18 ◽  
Author(s):  
MI Hasan ◽  
MG Kibria ◽  
M Jahiruddin ◽  
Y Murata ◽  
MA Hoque
Keyword(s):  
Nutrient Uptake ◽  
Antioxidant Defense ◽  
Growth Parameters ◽  
Growth And Yield ◽  
Growth Stages ◽  
Total N ◽  
Exogenous Application ◽  
S Uptake ◽  
Maize Plants ◽  
Different Growth Stages

Proline provides protection in plants against various abiotic stresses including salinity. The field experiment was conducted at the farmer’s field of coastal area (Botiaghata, Khulna) to mitigate the adverse effects of salinity on growth and yield of maize by exogenous application of proline. In the experiment maize plants were treated with different concentrations of proline at seedling and/or vegetative stages. The plant growth parameters, grain and stover yields, nutrient uptake and K+/Na+ ratio were recorded. All the yield contributing characters were significantly increased due to exogenous application of proline at different growth stages. Among the treatments, application of 100 mM proline at seedling and vegetative stages offered the highest grain and stover yields (5.7 t ha-1 and 9.8 t ha-1, respectively) of maize which was followed by 100 mM proline application at seedling stage where grain and stover yields were 5.7 t ha-1 and 9.7 t/ha, respectively. However no significant differences were found between two treatments. Total N, P and S uptake (203.66, 23.24 and 23.14 kg ha-1, respectively) were highest when the maize plants were treated with 100 mM proline at seedling and vegetative stages. The highest K+/Na+ ratio both in grain (12.92) and stover (5.57) was also observed in the same treatment. Therefore, it can be concluded that exogenous application of proline improves salinity tolerance in maize by increasing nutrient uptake and probably due to increasing antioxidant defense mechanisms.J. Environ. Sci. & Natural Resources, 8(1): 13-18 2015

scholarly journals Yield performance of some maize varieties as influenced by irrigation management at different growth stages

2019 ◽  
Vol 6 (1) ◽  
pp. 57-67
Author(s):  
Md Shahriar Kobir ◽  
Md Rashedur Rahman ◽  
AKM Mominul Islam ◽  
Suchana Paul ◽  
Md Monirul Islam ◽  
...  
Keyword(s):  
Irrigation Management ◽  
Grain Filling ◽  
Growth Stages ◽  
Yield Performance ◽  
Factor B ◽  
Leaf Stage ◽  
Filling Stage ◽  
Maize Varieties ◽  
Grain Filling Stage ◽  
Different Growth Stages

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from December 2017 to April 2018 to study the yield performance of some maize varieties as influenced by irrigation management at different growth stages. The experiment was laid out in a split plot design with three replications where factor (A) irrigation stages were allocated in main plots and factor (B) varieties were distributed in sub plots. In factor A five irrigation management viz. I0 = (No irrigation), I1= (Four leaf stage + eight leaf stage + tasselling stage+ grain filling stage), I2= (Four leaf stage+ eight leaf stage + tasselling stage), I3= (Eight leaf stage + tasselling stage +grain filling stage), I4=(Four leaf stage + tasselling stage+ grain filling stage), I5=(Four leaf stage+ eight leaf stage+ grain filling stage) and in factor B three varieties viz. V1= (BARI hybrid vutta-9), V2= (BARI hybrid vutta-13), V3= (pacific-559) were included as treatments in the experiment. Data were collected on yield and yield contributing characters. The highest grain yield (5.88 t/ha) was obtained with the water management treatment I1(Four leaf stage + eight leaf stage + tasselling stage+ grain filling stage) which is statistically similar to treatment I4(Four leaf stage + tasselling stage+ grain filling stage) and highest grain yield (5.87 t/ha) obtained due to the varietal factor V3 (pacific-559). Interaction between I1 irrigation treatment and V3 varietal factor (I1V3) were found to be the best combination which is statistically similar to I4V3 interaction. As I4 treatment and I4V3 interaction are cost effective than I1 treatment and I1V3 interaction, respectively, irrigation should be given at four leaf stage, tasselling stage, and grain filling stage with variety pacific-559 for better performance in maize production. Res. Agric., Livest. Fish.6(1): 57-67, April 2019

scholarly journals Clustering of Laser Scanner Perception Points of Maize Plants

2017 ◽  
Vol 8 (2) ◽  
pp. 204-209 ◽  
Author(s):  
D. Reiser ◽  
M. Vázquez-Arellano ◽  
M. Garrido Izard ◽  
D. S. Paraforos ◽  
G. Sharipov ◽  
...  
Keyword(s):  
Point Cloud ◽  
Laser Scanner ◽  
Point Clouds ◽  
Measurement Unit ◽  
Growth Stages ◽  
3D Point Clouds ◽  
Maize Plants ◽  
Robot Position ◽  
Stem Position ◽  
Different Growth Stages

The goal of this work was to cluster maize plants perception points under six different growth stages in noisy 3D point clouds with known positions. The 3D point clouds were assembled with a 2D laser scanner mounted at the front of a mobile robot, fusing the data with the precise robot position, gained by a total station and an Inertial Measurement Unit. For clustering the single plants in the resulting point cloud, a graph-cut based algorithm was used. The algorithm results were compared with the corresponding measured values of plant height and stem position. An accuracy for the estimated height of 1.55 cm and the stem position of 2.05 cm was achieved.

scholarly journals Growth of Nacre Biocrystals by Self-Assembly of Aragonite Nanoparticles with Novel Subhedral Morphology

Crystals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 3
Author(s):  
Ruohe Gao ◽  
Rize Wang ◽  
Xin Feng ◽  
Gangsheng Zhang
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
The Self ◽  
Growth Stages ◽  
Research Model ◽  
Biomimetic Materials ◽  
Transmission Electron ◽  
Nanoparticle Morphology ◽  
Different Growth Stages ◽  
Scanning Electron

Nacre has long served as a research model in the field of biomineralization and biomimetic materials. It is widely accepted that its basic components, aragonite biocrystals, namely, tablets, are formed by the nanoparticle-attachment pathway. However, the details of the nanoparticle morphology and arrangement in the tablets are still a matter of debate. Here, using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), we observed the nanostructure of the growing tablets at different growth stages and found that: (1) the first detectable tablet looked like a rod; (2) tablets consisted of subhedral nanoparticles (i.e., partly bounded by crystal facets and partly by irregular non-crystal facets) that were made of aragonite single crystals with a width of 160–180 nm; and (3) these nanoparticles were ordered in orientation but disordered in position, resulting in unique subhedral and jigsaw-like patterns from the top and side views, respectively. In short, we directly observed the growth of nacre biocrystals by the self-assembly of aragonite nanoparticles with a novel subhedral morphology.

Dicamba use and Injury on Soybeans(Glycine max)in South Dakota

Weed Science ◽  
1978 ◽  
Vol 26 (5) ◽  
pp. 471-475 ◽  
Author(s):  
D. E. Auch ◽  
W. E. Arnold
Keyword(s):  
Glycine Max ◽  
South Dakota ◽  
Field Experiments ◽  
Telephone Survey ◽  
Yield Reduction ◽  
Growth Stages ◽  
Anisic Acid ◽  
Different Growth Stages

Field experiments were conducted from 1974 to 1977 at Redfield and Centerville, South Dakota, to evaluate the tolerance of soybeans [Glycine max(L.) Merr.] at different growth stages and five varieties of soybeans to dicamba (3,6-dichloro-o-anisic acid) and to determine dicamba residue in the foliage. Yield reduction occurred from applications when soybeans were flowering. Furthermore, germination was reduced by dicamba application at pod-fill. Dicamba residue was detected in foliage 7 days but not 18 days after application. Extent of dicamba use and drift occurrence was determined by a telephone survey of 159 farmers. Thirty-one percent of the farmers surveyed used dicamba in 1976.

Varietal Tolerance of Rice (Oryza sativa) to Bromoxynil and Triclopyr at Different Growth Stages

1992 ◽  
Vol 6 (4) ◽  
pp. 968-974 ◽  
Author(s):  
Dan J. Pantone ◽  
John B. Baker
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Yield Reduction ◽  
Growth Stages ◽  
Average Yield ◽  
Visible Injury ◽  
Leaf Stage ◽  
Varietal Tolerance ◽  
Different Growth Stages

This study was conducted to determine the tolerance of three cultivars of rice (‘Lemont’, ‘Mars', and ‘Tebonnet’) to bromoxynil and triclopyr. The effects of two rates of application (the labeled rate and twice the labeled rate) at three different growth stages (two- to three-leaf stage, four- to five-leaf stage, and panicle initiation) on percent visible injury rating and percent grain yield reduction of rice were investigated. Percent visible injury ratings for triclopyr averaged across all rates and application times, were 15, 16, and 25% (LSD = 3%) for Tebonnet, Mars, and Lemont, respectively, whereas ratings for bromoxynil were 11, 8, and 7% injury (LSD = 2%). Tebonnet was more tolerant than Lemont to triclopyr with an average percent grain yield reduction, across treatments, of 6% compared with 9% for Mars and 12% for Lemont (LSD = 4%). Bromoxynil did not decrease the average yield of any of the three cultivars.

scholarly journals Physiological and morphological responses of sugar beet (Beta vulgaris L.) subjected to nano-boron oxide at different growth stages

2020 ◽  
Vol 63 (2) ◽  
pp. 103-111
Author(s):  
Alireza Pirzad ◽  
Mahmood Mazlomi Mamyandi ◽  
Razieh Khalilzadeh
Keyword(s):  
Sugar Beet ◽  
Boron Oxide ◽  
Block Design ◽  
Ground Cover ◽  
Yield Reduction ◽  
Growth Stages ◽  
Yield And Quality ◽  
Relative Water ◽  
Different Growth Stages ◽  
White Sugar

The deficiency and toxicity of boron may lead to noticeable yield reduction and quality loss of sugar beet. To evaluate the effects of nano-boron on the root yield and quality of sugar beet, factorial experiment was conducted based on a randomized complete block design with three replications at Urmia University. Treatments were spraying of nano-boron oxide (0, 2, 3 and 4 g L-1) at different growth stages (20, 40, 60, 80 and 100% of ground cover). Increasing levels of boron up to 3 g L-1 resulted in the highest SPAD (Soil Plant Analysis Development) value, leaf number and relative water content. With optimal leaf area (86.47 cm2), the highest yields of root, sugar, white sugar, and technological sugar (144.53, 28.23, 26.19 and 25.32 t ha-1) were determined in the treatment of 4 g L-1 boron at 40% of ground covered. Increasing nano-boron level under different growth stages increased sugar and white sugar contents, on contrary impurities (Na, K and α-amino-N) loss and molasses sugar percentage were decreased. More than 3 g L-1 nano-boron exhibited the highest values of purity. Application of 3 g L-1 boron at 40% of ground cover increased sugar and white sugar contents by 12.45 and 18.72%, respectively.

scholarly journals DRY MATTER PARTITIONING OF MAIZE PLANT AS AFFECTED BY WATER MANAGEMENT AT DIFFERENT GROWTH STAGES

2020 ◽  
Vol 1 (1) ◽  
pp. 31-36
Author(s):  
Md. Shahriar Kobir ◽  
Md. Rashedur Rahman ◽  
A.K.M. Mominul Islam
Keyword(s):  
Water Management ◽  
Dry Matter ◽  
Grain Filling ◽  
Maize Plant ◽  
Growth Stages ◽  
Dry Matter Partitioning ◽  
Leaf Stage ◽  
Filling Stage ◽  
Grain Filling Stage ◽  
Different Growth Stages

The research work was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, in the fiscal year 2017-2018 to study the dry matter partitioning of maize plant affected by water management at different growth stages. The research was conducted in a split plot design with three replications where irrigation stages were allocated in main plots and varieties were allocated in sub plots. There were five irrigation management treatments viz. I0 – (No irrigation), I1 – (Four leaf stage + eight leaf stage + tasselling stage+ grain filling stage), I2 – (Four leaf stage+ eight leaf stage + tasselling stage), I3- (Eight leaf stage + tasselling stage +grain filling stage), I4 -(Four leaf stage + tasselling stage+ grain filling stage), I5 -(Four leaf stage+ eight leaf stage+ grain filling stage) and there were three varieties viz. V1 – (BARI hybrid vutta-9), V2 – (BARI hybrid vutta-13), V3 – (pacific-559) in the experiment. The highest dry matter by root, culm, leaf, tassel and cob as well as by total dry matter and seed yield was obtained with the water management treatment I1(Four leaf stage + eight leaf stage + tasselling stage+ grain filling stage) which is statistically similar to treatment I4(Four leaf stage + tasselling stage+ grain filling stage) and the highest dry matter by root, culm, leaf, tassel and cob as well as total dry matter and seed yieldwas obtained due to the varietal factor V3 (pacific-559). Interaction between I1 irrigation treatment and V3 varietal factor (I1V3) were found to be the best combination for maximum dry matter production which is statistically similar to I4V3 interaction. As I4 treatment and I4V3 interaction are cost effective than I1 treatment and I1V3 interaction, respectively, irrigation should be given at Four leaf stage, tasselling stage, and grain filling stage with variety pacific-559 for maximum dry matter as well as for maximum grain production in maize

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