A climatological study of soil moisture under corn crop at Campina Grande (NE Brazil)

MAUSAM ◽  
2021 ◽  
Vol 48 (3) ◽  
pp. 437-442
Author(s):  
K.KARUNA KUMAR ◽  
JOSE ANTONIO TOMAS DA SILVA ◽  
VIRGINIA DE FATIMA BEZERRA
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Markov Chain Model ◽  
Moisture Loss ◽  
Growth Stages ◽  
Chain Model ◽  
Growing Period ◽  
Corn Crop ◽  
Order Markov Chain ◽  
Different Growth Stages

ABSTRACT. Results of a climatological study of soil moisture under corn crop at Campina Grande (NE Brazil) are presented in this paper. Daily values of available moisture content during the crop growing period are evaluated for a period of 25 years. A six zone versatile soil moisture budget model is used for this purpose and approximately 5. 7.5, 12.5, 25, 25 and 25% of the available water capacity (AWC) are attributed to zones one to six respectively. Different root activity coefficients are assumed for the six zones in different growth stages and the dependence of these coefficients on moisture content is taken into consideration. The same moisture releasing characteristics are assumed for all soil zones. On rainy days moisture loss due to evapotranspiration is assumed to take place before precipitation. Four AWC values and three corn growing periods between March and September are considered in this study. A first order Markov chain model is applied to the daily soil moisture data. Soil moisture averages and probabilities are used to identify the optimum growing period for corn at this station. The irrigation requirements of the crop are briefly discussed.  

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 Evaluation of crop growing periods at some stations in northest Brazil

MAUSAM ◽  
2021 ◽  
Vol 47 (2) ◽  
Author(s):  
K. KARUNA KUMAR ◽  
J. A. TOMAS DA SILVA
Keyword(s):  
Soil Moisture ◽  
Markov Chain Model ◽  
Model Parameters ◽  
Chain Model ◽  
Conditional Probabilities ◽  
Minimum Period ◽  
First Order ◽  
Temperature And Precipitation ◽  
Order Markov Chain ◽  
Dry Soil

Results of a study of crop .growing periods at some stations in northeast Brazil are presented in this paper. Daily soil moisture values for a minimum period of 25 years are evaluated by means of a simple soil moisture model using temperature and precipitation data. A first order Markov chain model is applied to the soil moisture data and initial and conditional probabilities of wet and dry soil days are obtained. Soil moisture averages and probabilities are used to evaluate crop growing periods at the stations. The effect of uncertainties in the model parameters on the estimated growing periods is investigated.

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.

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