scholarly journals Effects of Excessive Soil Moisture at Different Growth Stages on Seed Yield of Summer Buckwheat.

2000 ◽  
Vol 69 (2) ◽  
pp. 189-193 ◽  
Author(s):  
Hideki SUGIMOTO ◽  
Tooru SATO
Keyword(s):  
Soil Moisture ◽  
Seed Yield ◽  
Growth Stages ◽  
Different Growth Stages

scholarly journals The Modification of Difference Vegetation Index (DVI) in middle and late growing period of winter wheat and its application in soil moisture inversion

2019 ◽  
Vol 131 ◽  
pp. 01098
Author(s):  
Zhang Hong-wei ◽  
Huai-liang Chen ◽  
Fei-na Zha
Keyword(s):  
Soil Moisture ◽  
Winter Wheat ◽  
Vegetation Index ◽  
Vegetation Coverage ◽  
Growth Stages ◽  
Wheat Growth ◽  
Inversion Result ◽  
Growing Period ◽  
The Difference ◽  
Different Growth Stages

In the middle and late growing period of winter wheat, soil moisture is easily affected by saturation when using MODIS data to retrieve soil moisture. In this paper, in order to reduce the effect of the saturation caused by increasing vegetation coverage in middle and late stage of winter wheat, the Difference Vegetation Index (DVI) model was modified with different coefficients in different growth stages of winter wheat based on MODIS spectral data and LAI characteristics of variation. LAI was divided into three stages, LAI ≤ 1 < LAI ≤, 3 < LAI, and the adjusting coefficient of α=1, α=3, α=5, were taken to modifying the Difference Vegetation Index(DVI). The results show that the Modified Difference Vegetation Index (MDVIα) can effectively reduce the interference of saturation, and the inversion result of soil moisture in the middle and late period of winter wheat growth is obviously superior to the uncorrected inversion model of DVI.

scholarly journals Effect of Different Durations of Water-Logging at Different Growth Stages on Seed Yield of Sesame

2018 ◽  
Vol 1 (2) ◽  
pp. p68
Author(s):  
M. H. Ali
Keyword(s):  
Seed Yield ◽  
Growth Stage ◽  
Field Trials ◽  
Growth Stages ◽  
Differential Effects ◽  
Growing Period ◽  
Water Logging ◽  
Different Growth Stages

In Bangladesh, sesame suffers from water-logging during its growing period. Multi-year and multi-location field trials were carried out to study the effect of different durations of water-logging at different growth stages on seed yield of sesame. From two years results, it is revealed that the effects of water-logging during a particular growth stage or particular duration of water-logging on seed yield depends on pre- and/or post water-logging from the rainfall. Differential effects of the cultivars were also observed. The cultivar Binatil-2 and Binatil-3 showed reasonable seed yield under water-logging at flowering and mid pod-formation stages for 24 to36 hours.

scholarly journals Rainfed cultivation with supplemental irrigation modelling on seed yield and oil of Coriandrum sativum L. using precision agriculture and GIS moisture mapping

2021 ◽  
Author(s):  
Agathos Filintas ◽  
Eleni Wogiatzi ◽  
Nikolaos Gougoulias
Keyword(s):  
Soil Moisture ◽  
Essential Oil ◽  
Seed Yield ◽  
Precision Agriculture ◽  
Oil Content ◽  
Root Zone ◽  
Coriandrum Sativum ◽  
Gis Mapping ◽  
Growth Stages ◽  
Supplemental Irrigation

Abstract The aim of the present study was to determine the effects of rainfed and supplemental irrigation, and sowing period (SP) treatments on Coriander (Coriandrum sativum L.) yield, essential oil content and umbel heights by applying new agro-technologies (TDR-sensors for soil moisture (SM), GIS, Precision Agriculture, soil-hydraulic analyses and Geostatistical models) for yield and SM root zone geospatial modelling and two-dimensional GIS mapping. Results of laboratory analysis indicated a suitable soil for coriander's growth and revealed that field's soil was characterized Sandy Clay Loam(SCL) with mean values: Soil Organic Matter(SOM) = 1.70%, bulk specific gravity = 1.42 g·cm−3, Plant Available Water = 0.129 cm·cm−1, pH = 7.10 and cation-exchange capacity(CEC) = 19.3 cmol·kg−1. The two-way ANOVA statistical analysis (P = 0.05) results revealed that the irrigation treatments (IR1:rainfed, IR2:rainfed plus supplemental irrigation[best]), and the SP treatments (SP1:October's last week, SP2:November's first week[best]) significantly affects Coriander's seed yield and essential oil content, but the SP have no significant effect on plant's umbel height (P = 0.873). Supplemental irrigation, using a limited amount of water, if applied during the critical crop growth stages, can result in substantial improvement on seed yield (+284.934%), essential oil content (+125.396%) and plant's umbel height (+117.929%). HIGHLIGHT Geostatistical modelling on yield and oil of Coriander (Coriandrum sativum L.), GIS, Precision Agriculture, Rainfed cultivation with supplemental irrigation, Soil and hydraulic analyses, TDR-soil moisture mapping.

scholarly journals Changes of soil moisture during apple growth based on TVDI index

2021 ◽  
pp. 955-961
Author(s):  
Hui Kong ◽  
Dan Wu
Keyword(s):  
Remote Sensing ◽  
Soil Moisture ◽  
Vegetation Index ◽  
Growth Stages ◽  
Temporal Consistency ◽  
Vegetation Water Content ◽  
Content Index ◽  
Research Findings ◽  
Vegetation Water ◽  
Different Growth Stages

Based on MODIS data, soil moisture data and field survey data from 2014 to 2018, the consistency of temperature vegetation drought index (TVDL), normalized vegetation water content index (NDWL), vegetation water supply index (VSWI) and soil moisture at 15cm depth (SM) in apple growth in Fuxian county was investigated. Results showed that the spatial and temporal consistency between VSWI and SM calculated by the enhanced vegetation index (EVI) was best; the sensitivity of remote sensing indexes to soil moisture was different in different apple growth stages. The sensitivity of VSWI was the most obvious in different growth stages, and the sensitivity of soil moisture was higher than that of germination, flowering, fruit expansion and maturity. The research findings were consistent with the law of water demand in different growth stages of apple in Fuxian county and the characteristics of precipitation and drought in Fuxian county. The present results could provide a reference for soil moisture monitoring of apple growth by remote sensing. Bangladesh J. Bot. 50(3): 955-961, 2021 (September) Special

Sensitivity of Fieldbeans (Phaseolus vulgaris) to Reduced Rates of 2,4-D and Dicamba

Weed Science ◽  
1986 ◽  
Vol 34 (6) ◽  
pp. 953-956 ◽  
Author(s):  
Drew J. Lyon ◽  
Robert G. Wilson
Keyword(s):  
Acetic Acid ◽  
Phaseolus Vulgaris ◽  
Seed Yield ◽  
Germination Percentage ◽  
Growth Stages ◽  
Leaf Stage ◽  
Stages Of Growth ◽  
Dichlorophenoxy Acetic Acid ◽  
Different Growth Stages ◽  
Methoxybenzoic Acid

The effects of the dimethylamine salt of dicamba (3,6-dichloro-2-methoxybenzoic acid) and the dimethylamine salt of 2,4-D [(2,4-dichlorophenoxy)acetic acid] on fieldbeans (Phaseolus vulgarisL. ‘Great Northern Valley’) were studied in order to assess the potential hazards of using these herbicides in areas adjoining fieldbean production. Dicamba and 2,4-D were applied to fieldbeans at three different rates (1.1, 11.2, and 112.5 g ai/ha) and four different growth stages (preemergence, second trifoliolate leaf, early bloom, and early pod). Application of 2,4-D preemergence or in the second trifoliolate leaf stage of growth did not reduce seed yield, delay maturity, or reduce germination of seed obtained from treated plants. Dicamba or 2,4-D applied at 112.5 g/ha to fieldbeans in the early bloom or early pod stages of growth consistently reduced seed yield, delayed maturity, and reduced germination percentage. Fieldbeans exhibited a greater overall sensitivity to dicamba than to 2,4-D.

Time of Planting, Rainfall and Soil Moisture Effects on Cowpea in Sierra Leone

1979 ◽  
Vol 15 (4) ◽  
pp. 315-320 ◽  
Author(s):  
C. S. Kamara ◽  
W. Godfrey-Sam-Aggrey
Keyword(s):  
Soil Moisture ◽  
Grain Yield ◽  
Sierra Leone ◽  
Planting Date ◽  
Growth Stages ◽  
Total Rainfall ◽  
Planting Dates ◽  
Grain Yields ◽  
Moisture Effects ◽  
Different Growth Stages

SUMMARYAn experiment was conducted during the minor season in Sierra Leone to determine the optimum planting date for a photo-insensitive cowpea cultivar and study the relations between total rainfall and soil moisture available at different growth stages. Cowpeas planted in early September produced the tallest plants and higher grain yields than from other planting dates, since they benefited from 90% of the season's rainfall and made use of stored soil moisture. Average weekly rainfall or soil moisture in the top 15 cm of soil, recorded from planting to 50% flowering, can be used to predict cowpea grain yield.

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