Modelling rice yield with temperature optima of rice productivity derived from satellite NIRv in tropical monsoon area

PurposeThis paper analysed the motives behind farmers' savings with Rural and Community Banks (RCBs) and the effect of these savings on rice yield in the Hohoe Municipality of the Volta region of Ghana.Design/methodology/approachA multi-stage sampling approach was used to draw a random sample of 222 rice farmers, and a structured questionnaire was employed to collect cross-sectional data. A Likert scale was used to rank the motive behind farmers' savings while the endogenous switching regression model was used to estimate the effect of savings on rice yield.FindingsThe results of the study showed that most farmers mobilise savings to enhance farm investment which is critical to increasing rice productivity. Improved labour and fertiliser use had a positive influence on rice yield, while farm size had an inverse relation with rice yield. Further, the findings show that savings with RCBs help mobilise the necessary finance to enhance rice productivity. In terms of the treatment effect of savings, the results indicate that farmers who patronise saving products of RCBs recorded a statistically significant average yield of 1.41 Mt/ha more than those not patronising saving products from any bank.Practical implicationsWhile the literature on agricultural finance focuses largely on credit, this study demonstrates that savings hold significant benefits for the development of agriculture through productivity gains. The importance of this demonstration is further shown by the fact that credit access depends on the ability to save in most developing countries.Social implicationsThere is a need to educate farmers about the essence of patronising formal savings products.Originality/valueThis study represents the first attempt at linking farmers' savings to agricultural productivity using an econometric methodology in Ghana. The study serves as a foundation paper and for that matter will serve as a guide to future research on savings mobilisation and agricultural productivity nexus.

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Prediction of rice productivity in Kandhamal district of Orissa using simulation modeling

International Journal of Modeling Simulation and Scientific Computing ◽

10.1142/s1793962314500214 ◽

2014 ◽

Vol 05 (04) ◽

pp. 1450021

Author(s):

Banshidhar Panda ◽

Milu Acharya ◽

Dwitikrishna Panigrahi

Keyword(s):

Sensitivity Analysis ◽

Simulation Model ◽

Sample Size ◽

Model Validation ◽

Test Data ◽

Simulation Modeling ◽

Rice Yield ◽

Correlation Test ◽

Rice Productivity ◽

Auto Correlation

Simulation technique has been employed to predict rice yield of Kandhamal plateaus in Orissa (India) using the data of previous years. Preliminary simulation model has been developed. The test for uniformity and independence has been conducted using Kolmogrov–smironov test and auto-correlation test, respectively. The result obtained has been subjected to testing of hypothesis by using two sided test. Data for five years (1995 to 2000) are used for model validation and the sample size is increased to 12 years i.e., from 1995 to 2007 for prediction up to 2012. Sensitivity analysis is conducted by changing the parameters within feasible limits to find out the effect on the model.

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Organic manures for increased rice productivity and sustained supply of Fe to rice

Acta Agronomica Hungarica ◽

10.1556/aagr.52.2004.4.8 ◽

2005 ◽

Vol 52 (4) ◽

pp. 391-397 ◽

Cited By ~ 2

Author(s):

B. N. Mishra ◽

R. Prasad ◽

B. Gangaiah

Keyword(s):

Wheat Straw ◽

Field Experiments ◽

Rice Yield ◽

Green Manures ◽

Initial Value ◽

Good Source ◽

Organic Manures ◽

Green Manuring ◽

Rice Productivity ◽

Straw Incorporation

Field experiments were carried out for 3 years to assess the efficacy of organic manures (Sesbania, Leucaena, cowpea, mungbean, wheat straw and FYM) in enhancing the productivity of rice and in supplying Fe. Green manuring with Sesbania gave the highest rice yield, whereas the lowest yield was recorded with wheat straw incorporation. The concentration and uptake of Fe by rice was significantly higher with organic manures. The Fe status of the soil after 3 crops of rice declined from the initial value, but the decline was least with FYM, followed by green manures. The application of organic manures is a good source for a sustained supply of Fe in soil.

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Varietal Improvement of Normal Season Irrigated Rice for Eastern Terai Region of Nepal

International Journal of Applied Sciences and Biotechnology ◽

10.3126/ijasbt.v4i4.16255 ◽

2017 ◽

Vol 4 (4) ◽

pp. 489-497

Author(s):

Hari Kumar Prasai ◽

Rudra Bhattarai ◽

Jivan Shrestha

Keyword(s):

Grain Yield ◽

Agricultural Research ◽

Rice Yield ◽

Research Station ◽

Irrigated Rice ◽

Rice Productivity ◽

Agricultural Research Station ◽

Check Variety ◽

Varietal Improvement

The coordinated and regional varietal trial of normal season irrigated rice was carried out at Regional Agricultural Research Station (RARS), Tarahara, Nepal in 2014 & 2015. Out of the tested genotypes, NR 2157-166-1-3-5-1, Cieharang and NR 2157-166-2-1-1-1 identified as promising with potential grain yield of 4313, 4290 and 4239 kg/ha respectively in over year analysis (2014-15) under coordinated varietal trial (CVT). These genotypes recorded 25 to 27 percent higher grain yield than national rice productivity and 4 to 6 percent more than check variety, Sabitri. The differences in grain yield among the tested genotypes and between the years were found significant, but interaction of genotypes to year was found non-significant. Similarly, KARAJAT-3 recorded the highest grain yield (4897 kg/ha) followed by NR 1190-24-4-2-2-2-3-2 (4861 kg/ha) in over year analysis (2014-15) of regional varietal trial (RVT), similarly, identified as promising genotypes. These promising genotypes recorded 43 and 8 percent higher grain yield than national rice yield and to the check variety, Sabitri, respectively in over year analysis. The differences in grain yield among genotypes and year were found significant whereas it was non-significant for interaction of genotypes and to the tested years.Int J Appl Sci Biotechnol, Vol 4(4): 489-497

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Leaf phenology and trunk growth of Avicennia alba (Blume) under a seasonally fluctuating saline environment in the tropical monsoon area of eastern Thailand

Ecological Research ◽

10.1111/1440-1703.12251 ◽

2021 ◽

Author(s):

Piyapon Kankong ◽

Sasitorn Poungparn ◽

Akira Komiyama ◽

Chadtip Rodtassana ◽

Tamanai Pravinvongvuthi

Keyword(s):

Leaf Phenology ◽

Saline Environment ◽

Monsoon Area ◽

Tropical Monsoon ◽

Avicennia Alba

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Gender gap in rice productivity: evidence from Vietnam

International Journal of Social Economics ◽

10.1108/ijse-12-2017-0623 ◽

2019 ◽

Vol 46 (2) ◽

pp. 241-251 ◽

Cited By ~ 2

Author(s):

Thi Kieu Van Tran ◽

Ehsan Elahi ◽

Liqin Zhang ◽

Van Huyen Bui ◽

Quang Trung Pham ◽

...

Keyword(s):

Gender Gap ◽

Gender Discrimination ◽

Rice Yield ◽

Household Survey ◽

Endowment Effect ◽

Future Research ◽

Data Set ◽

Content Type ◽

Rice Productivity ◽

Female Headed Households

PurposeThe purpose of this paper is to investigate the determinants of the gender gap in the gross value of rice yield in Vietnam.Design/methodology/approachA panel data set of 12 provinces of Vietnam from 2010 to 2014 was used, collected from the Vietnam access to resources household survey. To measure the gender gap in the gross value of rice yield, two-stage least squares and Blinder – Oaxaca decomposition methods were used.FindingsThe gross value of rice productivity of male-headed households was 10.3 percent higher than that of female-headed households. The gender gap in rice productivity is caused by the endowment and structural effects; the endowment effect explained 53 percent of the gender gap in rice productivity and the structural effect 42 percent.Practical implicationsIn order to reduce the gender gap and improve the gross value of rice yield, the following policies are suggested: female education and access to institutional services (extension and credit) should be improved and future research is needed to determine the reasons for gender discrimination in the agricultural production system.Originality/valueThe findings suggest that the difference in the gross value of rice yield between male- and female-headed households were mainly caused by endowments and returns from those endowments.

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Badland Erosion and Its Morphometric Features in the Tropical Monsoon Area

Remote Sensing ◽

10.3390/rs11243051 ◽

2019 ◽

Vol 11 (24) ◽

pp. 3051 ◽

Cited By ~ 2

Author(s):

Ci-Jian Yang ◽

Li-Wei Yeh ◽

Yeuan-Chang Cheng ◽

Chia-Hung Jen ◽

Jiun-Chuan Lin

Keyword(s):

Hydrological Cycle ◽

Low Cost ◽

Drainage Density ◽

Climatic Conditions ◽

Strong Positive Correlation ◽

Climatic Effects ◽

Slope Length ◽

Positive Correlation ◽

Monsoon Area ◽

Tropical Monsoon

Climatically driven processes are important controls on the Earth’s surface and on interactions between the hydrological cycle and erosion in drainage basins. As a result, landscape forms such as hillslope topography can be used as an archive to reconstruct historical climatic conditions. Recent progress in the Structure-from-Motion (SfM) photogrammetric technique allows for the construction of high-resolution, low-cost topography data using remote-controlled unmanned aerial vehicle (UAV) surveys. Here, we present the climatic effects on the hillslope erosion rate that can be obtained from the drainage frequency of hillslopes. We quantify the centimeter-scale accuracy of surveys across 72 badland hillslopes in SE Taiwan, which is a tropical monsoon area with an annual precipitation of over 2 m. Our observations indicate that climatic erosion results in a higher drainage frequency and the number of furrows, instead of drainage density. Additionally, the morphometric slope index (MSI) has a strong positive correlation with erosion and its rate but shows a negative correlation with drainage length and a positive correlation with inclination. This suggests that the erosion pattern is due to gravitational mass wasting instead of hydrological erosion. MSI should always be calculated relying on the normalized slope length and is less applicable to landslide-dominated erosion. We, therefore, suggest that UAV-driven digital elevation models (DEMs) are integrated into erosion mapping to aid in identifying erosion patterns. We highlight the unique opportunity for cross-climate zone comparative studies offered by badland landscapes and differential rainfall patterns, with remote sensing techniques and the morphometric slope index.

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THE INFLUENCE OF ETHANOL ON THE CONVERSION OF PREGNENOLONE TO PROGESTERONE BY HUMAN PLACENTAL MICROSOMES

Acta Endocrinologica ◽

10.1530/acta.0.0760178 ◽

1974 ◽

Vol 76 (1) ◽

pp. 178-188 ◽

Cited By ~ 3

Author(s):

H. Lübbert ◽

K. Pollow ◽

R. Wagner ◽

J. Hammerstein

Keyword(s):

Kinetic Parameters ◽

Enzyme Preparation ◽

Ethanol Concentration ◽

Hydroxysteroid Dehydrogenase ◽

Product Formation ◽

Linear Increase ◽

Maximal Velocity ◽

Microsomal Enzyme ◽

Temperature Optima ◽

Substrate Concentrations

ABSTRACT The effects of ethanol on kinetic parameters of placental Δ5-3β-hydroxysteroid dehydrogenase were studied. In the presence of high pregnenolone concentrations (50 μm, [S] > Km) the microsomal enzyme preparation exhibited an almost linear increase in activity as the ethanol concentration in the medium was raised from 2.5 to 15 % (v/v). At lower substrate concentrations ([S] << Km) ethanol caused inhibition. Other effects of ethanol were: linearity of product formation with time was prolonged; the maximal velocity was markedly increased; the Km for pregnenolone slightly decreased with increasing ethanol concentrations (2.5 to 10 %, v/v) whereas the Km for NAD remained the same. The pH and temperature optima of the reaction were unaffected by ethanol. Other organic solvents caused similar effects.

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