scholarly journals Prospect of double cropping of rainfed rice in West Bengal

MAUSAM ◽  
2021 ◽  
Vol 49 (1) ◽  
pp. 121-126
Author(s):  
H. P. DAS ◽  
S. V. DATAR
Keyword(s):  
Markov Chain ◽  
West Bengal ◽  
Monsoon Season ◽  
Growing Season ◽  
Threshold Value ◽  
Rainfall Data ◽  
Ranking Method ◽  
Growing Period ◽  
Rainfed Rice ◽  
Double Cropping

The prospect of double cropping of rain fed rice in West Bengal has been studied in two agroecological conditions (Canning, located in coastal saline region and Nagri, located in Red lateritic region) by identifying growing season through the analysis of rainfall data. The rainfall data of these locations have been analysed for dry and wet weeks by assuming a dry threshold value of 20 mm per week. Wet and dry weeks have been subjected to Markov Chain probability analysis and periods of ideal sowing have been determined. Rainfall data has also been accumulated from 1st  week (1- 7 Jan) onwards, and 52nd week (24- 31 Dec) backwards and by subjecting it to ranking method, growth periods of dry and wet crops have been determined. The study reveals that generally from 24th to 37th week (11 Jun-16 Sep) the probability of getting wet weeks exceeds 15% and probability of two consecutive dry weeks is negligible from 20th to 38th week (14 May - 23 September) for both the statistics. It is also found that harvesting two rice crops of shorter duration is feasible during the growing period covering pre-monsoon and monsoon season.

scholarly journals Studies on fish diversity concerning Hydro-ecology of Kangsabasti river in Purulia district, West Bengal, India

2020 ◽  
Vol 26 (2) ◽  
Author(s):  
Manab Kumar Saha
Keyword(s):  
Fish Species ◽  
Physicochemical Parameters ◽  
West Bengal ◽  
Monsoon Season ◽  
Fish Diversity ◽  
Riverine Ecosystem ◽  
Post Monsoon ◽  
Fish Catch ◽  
Purulia District

Fish diversity depends both on various physicochemical parameters and the biological components of the riverine ecosystem. During the study period from January 2017 to December 2019 the highest fish diversity and density were observed in post-monsoon and lowest in pre-monsoon season in the Kangsabati River, Purulia District of West Bengal. Twenty five fish species, associated with 19 genera, 10 families and 5 orders have been identified. It was recorded that the Cyprinidae was the predominant family, which represented 56% of the entire fish catch.

SEASONAL LEADER GROWTH OF LODGEPOLE PINE IN THE SUBALPINE FOREST OF ALBERTA

1958 ◽  
Vol 34 (4) ◽  
pp. 382-386 ◽  
Author(s):  
K. W. Horton
Keyword(s):  
Growth Rates ◽  
Direct Relationship ◽  
Lodgepole Pine ◽  
Growing Season ◽  
Subalpine Forest ◽  
Growing Period

The weekly leader growth of lodgepole pine saplings showed similar patterns but different growth rates according to aspect of site. The seasonal growing period consistently started in early May and was 12 weeks long but within this period the distribution of growth differed widely from year to year. A direct relationship existed between weekly growth and corresponding mean weekly temperatures, except toward the end of the growing season.

scholarly journals An Improved Prediction Model Combining Inverse Exponential Smoothing and Markov Chain

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Tong Niu ◽  
Lin Zhang ◽  
Bo Zhang ◽  
Bofan Yang ◽  
Shengjun Wei ◽  
...  
Keyword(s):  
Markov Chain ◽  
Prediction Model ◽  
Threshold Value ◽  
Exponential Smoothing ◽  
Initial Value ◽  
Trend Prediction ◽  
Index Model ◽  
Model Combining ◽  
Improved Model ◽  
Setting Parameters

On the basis of the triple exponential smoothing prediction model, this paper introduces the reverse prediction idea and establishes the reverse triple exponential smoothing model by setting parameters such as threshold value and iteration times and reasonably correcting its initial value. This method can effectively reduce the error of early prediction value. At the same time, aiming at the problem that the predicting advantage of the reverse triple exponential smoothing model weakens in the later period, Markov theory is introduced to correct its error value, and an improved prediction model combining inverse exponential smoothing and Markov chain is further established. The improved model combines the advantages of index model trend prediction and Markov fluctuation prediction, and the prediction accuracy and stability of the model are significantly improved through case tests.

scholarly journals Markov chain models for pre-monsoon season thunderstorms over Pune

2002 ◽  
Vol 22 (11) ◽  
pp. 1415-1420 ◽  
Author(s):  
M. K. Kulkarni ◽  
S. S. Kandalgaonkar ◽  
M. I. R. Tinmaker ◽  
Asha Nath
Keyword(s):  
Markov Chain ◽  
Monsoon Season ◽  
Markov Chain Models

scholarly journals Analysis of Rainfall Probabilities for Strategic Crop Planning in Raipur District of Chhattisgarh State

2015 ◽  
Vol 10 (1) ◽  
pp. 253-257
Author(s):  
Sanjay Bhelawe ◽  
M Manikandan ◽  
Rajesh Khavse ◽  
J Chaudhary ◽  
S Patel
Keyword(s):  
Monsoon Season ◽  
Winter Season ◽  
Probability Level ◽  
North East ◽  
Rainfed Rice ◽  
South West Monsoon ◽  
Average Rainfall ◽  
Seasonal Basis ◽  
Average Condition ◽  
West Monsoon

Rainfall data of recent forty three years (1971-2013) of Labhandi station, Indira Gandhi Krishi Vishwavidhyalaya Raipur, Chhattisgarh was analysed with the method of incomplete gamma probability. The data revealed that the average rainfall of labhandi station is 1202 mm spread over 61 rainy days. Out of this 1055, 68, 53 and 27 mm received from south west monsoon (June-September), north east (October-December), summer (March-May) and winter season (January -February) respectively. Probability for receiving more than 100 mm of rainfall can be expected only at 25% probability level and that too in four weeks which is leading to the interpretation that rainfed rice production is a challenging task in this region. it has been found that at 75 per cent assured probability level rainfall of more than 200 mms can be expected only in July and August months and this rainfall is hardly sufficient for meeting the water requirement in upland situations. However at 50 per cent probability which is equivalent to average condition, cultivation of rice is possible under well water management conditions. On seasonal basis rainfall at assured probability level of 75% is not sufficient as the quantity is 795 mm rainfall in south-western monsoon season.

scholarly journals Nor’wester over West Bengal and comfortability

MAUSAM ◽  
2021 ◽  
Vol 58 (2) ◽  
pp. 177-188
Author(s):  
K. K. CHAKRABARTY ◽  
A. K. NATH ◽  
S. SENGUPTA
Keyword(s):  
Relative Humidity ◽  
West Bengal ◽  
Monsoon Season ◽  
Early Morning ◽  
Positive Aspect ◽  
Weather Factors ◽  
Thermal Index ◽  
The People ◽  
Tropical Areas ◽  
Weather Parameters

During the pre-monsoon months of March, April and May the weather over Kolkata is generally very uncomfortable due to high temperature and relative humidity. During this season Kolkata is affected by the nor’wester activity. Generally the nor’wester activity is defined as a disastrous weather activity and is locally called as ‘Kaalbaisakhi’ as it is ‘kaal’ or destruction during Bengali Baishakh (April-May) month over Bengal. However the downdraft associated with the nor’wester brings cool air and temperature sometimes drops by as much as 8 to 9 degree Celsius and the atmosphere becomes comfortable for some period. This is an entirely different and positive aspect of nor’wester.The human comfortability depends upon many weather parameters apart from human physiological parameters. However the primary weather factors are air temperature and relative humidity especially for tropical areas. Many authors have worked on this and the well accepted formula for thermal index THI or Discomfort Index DI is taken from Thom (1957,1958) which is a function of dry bulb and wet bulb temperature i.e., THI or DI = 0.4 (Ta + Tw) + 15 where temperature is in ºF and is 0.72 (Ta + Tw) + 40.6 where temperature is in ºC. Various stages of comfortability are classified viz., (i) Discomfortable (ii) Partial discomfortable and (iii) Comfortable. Neglecting the effect of wind and further simplifying the equation for DI as a function of (Ta + Tw) the range varies from 27 to 55 in increasing order of temperature.During the pre-monsoon months when the climate over Kolkata is very sultry and uncomfortable, people generally desire the onset of nor’wester for some temporary relief although it results into destruction. The nor’wester makes the weather comfortable after its occurrence and remains comfortable for 10 to 12 hours and some time even for a day. The present study is made taking six years data over Kolkata, both Alipore and Dum Dum. It is seen that except early morning of March the remaining period of pre-monsoon season is found to be uncomfortable climatologically. In the present study there were 91 occasions of squalls and it is found that most of the squalls occurred during the month of April and May and on most of the occasions nor’wester made the weather comfortable for a large part of the day in the month of April. By the end of May nor’wester activity also brought relief but not to that extent as in March and April to the people of Kolkata and neighbourhood.

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