scholarly journals Potassium Fractions and Rice Yield in Different Agro-ecological Zones of Bangladesh

2021 ◽  
pp. 35-41
Keyword(s):  
Dry Matter ◽  
Rice Yield ◽  
Rice Variety ◽  
Water Soluble ◽  
Cropping Intensity ◽  
Exchangeable K ◽  
Ecological Zones ◽  
Fertilizer Recommendation ◽  
High Yielding Varieties ◽  
Agro Ecological Zones

Response of Potassium (K) is boosted due to the introduction of high-yielding varieties and cropping intensity. So, a pot experiment was done to see the allocation of native and added K in soils and the response of this on rice. Seven soil samples from seven AEZs. An amount of 1-kilogram soil was taken in each of 28 earthen pots of which 14 pots for cultivation rice and 14 pots for without cultivation as a control. Potassium and other fertilizers applied as follows Fertilizer Recommendation Guide-1012. Two replicate plots were used per treatment. Then the soils were saturated with water so that the soils could be soaked well. The pots were kept in this condition for one day to allow the soils to settle in the pots properly. The rice variety used for the experiment was BRRI dhan28. All forms of K were found to remarkable decrease due to cultivation. The depleted non-exchangeable K sum was the largest, this was followed by exchangeable and then, in control plots, water-soluble K. The depleted amount of exchangeable and non-exchangeable K was almost similar but higher than water-soluble K in treated pots. A significant variation was found among the yields ranging from 3.77 to 5.48 g pot-1. The average dry matter yield of treated pots 4.75 g pot-1 was significantly higher than non-treated pots 3.10 g pot-1.

scholarly journals Different soil potassium fractions and their contribution towards its uptake under long-term rice-rice cropping system in an Inceptisol of subtropical eastern India

2021 ◽  
Vol 58 (2) ◽  
pp. 262-271
Author(s):  
Raghabananda Nayak ◽  
Kumbhakarna Rout ◽  
Mitali Mandal ◽  
Abhiram Dash
Keyword(s):  
Ammonium Acetate ◽  
Biomass Yield ◽  
Rice Variety ◽  
Water Soluble ◽  
Soluble Form ◽  
Major Contributor ◽  
Fertilizer Management ◽  
Exchangeable K ◽  
Pot Culture

A pot culture experiment was conducted by taking soils from a long term fertilizer experimental field to evaluate the contribution of different K fractions towards rice biomass yield and potassium uptake in different long term fertilizer management practices. Twelve different soils were taken for pot culture and graded dose of potassium @ 0, 20, 40, 60, 80 and 100 kg K2O ha-1 was applied. Rice variety Lalat was grown as test crop. The forms of potassium were determined in the surface soil of 0-15 cm after maturity of crop. The result shows that water soluble form of K is the major contributor to biomass yield in soils taken from100% PK, 100% NPKZn, 100% NPKZnB,100% NPKZnS,100% NPK lime and control treated plots of the main field where as exchangeable K is dominant form of K in 100% NPK and 150% NPK. Ammonium acetate K contributes to yield in NPKFYM lime treatment. The nitric acid extractable K is a major contributor to yield in 100% NPKFYM,100% N or100% NP treatment. The water soluble form of K is the major source towards uptake in 150% NPK, NPKFYM lime ,100% NPKZnB, or control. Ammonium acetate K becomes the main source by applying 100% PK,100% NPK,100% NPKZn,100% NPKZnSor 100% NPKlime whereas exchangeable K becomes major contributor by100%N,or 100% NP application and 1 N HNO3 extractable K is the main source of K uptake in NPKFYM treatment. Therefore due importance of different form of potassium should be given in soil test value for better fertilizer management.

scholarly journals Forage mission for alleviating feed deficit situation of livestock in Nepal

2018 ◽  
Vol 17 ◽  
pp. 24-29
Author(s):  
Banshi Sharma
Keyword(s):  
Dry Matter ◽  
Animal Feed ◽  
High Mountain ◽  
Mountain Regions ◽  
Mountain Areas ◽  
Ecological Zones ◽  
Forage Plant ◽  
Fodder Crops ◽  
Land Improvement ◽  
Agro Ecological Zones

Nepal is divided in five agro-ecological zones. There is feed deficit in every zones except in high mountain regions. There is 34% deficit in animal feed (Singh, 2002). The forage mission* is carried out in 49 districts of the country with the aim of providing sufficient green and dry matter to improved livestock of the country to yield more milk from cattle and buffalo. Similarly more meat from buffaloes, sheep and goats has been obtained. Pasture land improvement is in high mountain areas. In mid hills, cultivation of forages such as stylo, molasses, mulato, setaria, joint vetch, leucaena, napier , forage peanut, desmodium and climbing legumes such as fodder peas have been promoted. In Terai, intensive cultivation of fodder crops: basically winter forages- oat, berseem and vetch is going to be popular. Feeding the legumes and non-legumes forage plant in suitable ratio helps a great extend in livestock production.

Soil factors affecting the availability of potassium to plants for Western Australian soils: a glasshouse study

Soil Research ◽  
2001 ◽  
Vol 39 (3) ◽  
pp. 611 ◽  
Author(s):  
Y. Pal ◽  
R. J. Gilkes ◽  
M. T. F. Wong
Keyword(s):  
Clay Minerals ◽  
Dry Matter ◽  
Growth Period ◽  
Water Soluble ◽  
Dry Matter Yield ◽  
K Uptake ◽  
Factors Affecting ◽  
Exchangeable K ◽  
Weathering Processes ◽  
K Depletion

A glasshouse experiment was conducted with 41 surface and 8 subsurface soils to measure their potassium (K) supply capacities and K depletion of soils by ryegrass growth for 260 days and harvesting at ~40-day intervals. Dry matter yield ranged from 0.22 g to 25.4 g/kg soil, cumulative K uptake ranged from 0.006 to 1.49 cmol/kg soil, and values of K concentration (%) in the first cut herbage ranged from 0.40% to 5.97%. Some of the light-textured soils were so impoverished in K that symptoms of K deficiency appeared during the first growth period. Water-soluble K + exchangeable K accounted for 43–100% of cumulative K uptake by the ryegrass. Multiple regression analysis indicated that 68% of the variation in dry matter yield and 90% of the variation in K uptake may be predicted by the exchangeable K content of these soils. The 6 harvests of ryegrass extracted only 0.21–12.07% of total K from these soils, which was not sufficient to cause discernible mineralogical changes in most soils. For some soils vermiculite was formed at the expense of illite/mica by K release to plants. For soils containing vermiculite but no other K-bearing clay minerals, vermiculite peaks broadened on K depletion by plants. Major proportions of total K in these soils are present in silicate minerals, yet only minor amounts are released to plants by very slow weathering processes. For soils that do not contain any K bearing clay minerals, very minor amounts of feldspar may have dissolved to release K.

scholarly journals Evaluation of nutrient uptake of selected cover crops and biochar on the yield advantage of two taro (Colocasia esculenta) cultivars in Samoa

2018 ◽  
Vol 36 (1) ◽  
pp. 9
Author(s):  
Sanjay Anand
Keyword(s):  
Nutrient Uptake ◽  
Cover Crops ◽  
Dry Matter ◽  
Mucuna Pruriens ◽  
Site Specific ◽  
Ecological Zones ◽  
Fallow Systems ◽  
Coconut Shells ◽  
Yield Responses ◽  
Agro Ecological Zones

A study was conducted in three agro ecological zones of Samoa to compare the dry matter yields and nutrient uptake of selected tropical cover crops and biochar application on different Samoan inceptisols. Subsequent improvements in corm yield of the two taro cultivars, (Samoa 1 and Samoa 2), under these fallow systems were also determined. The split-plot arrangement with main plots as cover crops and subplots as the cultivars was used, with four replications. The evaluated cover crops included: a reference – grass fallow treatment (farmers practice), Mucuna pruriens, Erythrina subumbrans, Mucuna pruriens + 200 kg of NPK fertiliser (12-5-20), farmer’s reference practice + 400 kg of NPK fertiliser (12-5-20), and biochar produced from coconut shells. The biomass samples were collected after the six month of fallow duration. Plant tissue analyses revealed that the nitrogen and the phosphorus contents of erythrina was higher than corresponding mucuna cover across all three sites. However, as a result of higher biomass production, Mucuna pruriens showed the highest nutrient accrual over the six month fallow duration. The general yield trend under different fallow practices across all the sites indicates that mucuna with modest supplementation of complete fertilisers can help maintain optimum taro yields. However, it appears that the yield responses of the taro crop to fallow treatments are site-specific.

scholarly journals Towards Understanding Variability in Droughts in Response to Extreme Climate Conditions over the Different Agro-Ecological Zones of Pakistan

2021 ◽  
Vol 13 (12) ◽  
pp. 6910
Author(s):  
Adil Dilawar ◽  
Baozhang Chen ◽  
Arfan Arshad ◽  
Lifeng Guo ◽  
Muhammad Irfan Ehsan ◽  
...  
Keyword(s):  
Pearson Correlation ◽  
Principal Component ◽  
Mitigation Strategies ◽  
Precipitation Extremes ◽  
Climate Mitigation ◽  
Mean Annual Temperature ◽  
Climate Extreme ◽  
Ecological Zones ◽  
The Mean ◽  
Agro Ecological Zones

Here, we provided a comprehensive analysis of long-term drought and climate extreme patterns in the agro ecological zones (AEZs) of Pakistan during 1980–2019. Drought trends were investigated using the standardized precipitation evapotranspiration index (SPEI) at various timescales (SPEI-1, SPEI-3, SPEI-6, and SPEI-12). The results showed that droughts (seasonal and annual) were more persistent and severe in the southern, southwestern, southeastern, and central parts of the region. Drought exacerbated with slopes of −0.02, −0.07, −0.08, −0.01, and −0.02 per year. Drought prevailed in all AEZs in the spring season. The majority of AEZs in Pakistan’s southern, middle, and southwestern regions had experienced substantial warming. The mean annual temperature minimum (Tmin) increased faster than the mean annual temperature maximum (Tmax) in all zones. Precipitation decreased in the southern, northern, central, and southwestern parts of the region. Principal component analysis (PCA) revealed a robust increase in temperature extremes with a variance of 76% and a decrease in precipitation extremes with a variance of 91% in the region. Temperature and precipitation extremes indices had a strong Pearson correlation with drought events. Higher temperatures resulted in extreme drought (dry conditions), while higher precipitation levels resulted in wetting conditions (no drought) in different AEZs. In most AEZs, drought occurrences were more responsive to precipitation. The current findings are helpful for climate mitigation strategies and specific zonal efforts are needed to alleviate the environmental and societal impacts of drought.

Stock and stability of organic carbon in soils under major agro-ecological zones and cropping systems of sub-tropical India

2021 ◽  
Vol 312 ◽  
pp. 107317
Author(s):  
Nirmalendu Basak ◽  
Biswapati Mandal ◽  
Ashim Datta ◽  
Manik Chandra Kundu ◽  
Arvind Kumar Rai ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Cropping Systems ◽  
Ecological Zones ◽  
Agro Ecological Zones
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