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Authors: Prabha, Sneh
Advisor: Prasad, S. S.
Title: Spatial distribution of different pools of potassium in North Bihar Soils
Publisher: Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur)
Language: en
Type: Thesis
Pages: 50+xi
Agrotags: null
Keywords: Soils, Spatial distribution, Potassium pools, North Bihar
Abstract: The present investigation entitled “Spatial distribution of different pools of potassium in North Bihar soils” was carried out at Tirhut College of Agriculture, Dholi an unique campus of Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar in year 2016-2017. Soils of North Bihar extending between 88°17'17.04" E to 83°54'18.02" E longitude and 27°17'4.44" N to 25°29'58.17" N latitude having a vast area of 52,925 sq km. Potassium (K) is the third major nutrient after N and P, required by plants for buildup of biomass. It exists in soil in different forms and these forms are in quasi equilibrium with each other. K is essential in modern agriculture, horticulture and vegetable crops as it makes plants tolerant to drought and frost and resistant to a number of diseases and pest attack besides its impact on yield and quality. Now a day, K is recognized as an important limiting factor in crop production. In the absence of adequate K fertilization, significant depletion of soil K reserve takes place, effect of which is substantial yield loss and higher economic risk of farmers. In the year 2020, the deficit of K in Indian agriculture is projected to be around 10 million tonnes/annum while the estimates for N and P balances are positive (Srinivasarao et al., 2001). Such a deficit will create serious nutrient imbalances with major implications on factor productivity and environment. It is worthwhile to note that even the most progressive and productive states like Punjab and Haryana, have most skewed N:P2O5:K2O ratio. The focus has been on N followed by P and very little use of K resulting in a huge imbalance. Geographical Information Systems offer the flexibility to visualize the spatial information in an easier way. With the availability of open source geographic information system software and high end computing facilities at low cost, use of GIS for scientific and utilities management has increased substantially. The GIS consists of organizing the information of an attribute in systematic continuous grids popularly known as raster maps or in continuous polygon (vector maps). The soils developed by sediments deposit of Gandak, Budhi Gandak and Bagmati rivers are calcareous in nature, whereas the soils developed by sediments deposit of Kosi, Adhwara group and Kamala Balan rivers are non-calcareous in nature. The study had primary objectives to assess different fractions of K in soils, to correlate available K with different K fractions and soil characteristics and to prepare GIS-aided maps for spatial distribution pattern of different forms of K and their combination. One hundred twenty one samples were collected on grid basis with coordinates through GPS and thematic soil maps were prepared using TNTmips (2010) GIS software. Wide variation in water soluble K (3.5 ppm to 67 ppm), exchangeable K (12 ppm to 274 ppm), available K (17 ppm to 330 ppm), non-exchangeable K (65 ppm to 2101 ppm), nitric acid soluble K (126 ppm to 2431 ppm) and total K (469 ppm to 22471.20 ppm) were recorded in soils of North Bihar and are present in following order viz. total K > nitric acid soluble K > non-exchangeable K > available K > exchangeable K > water soluble K. Significant correlation and regression were found among various soil properties and pools of K. Correlation coefficient with organic carbon and pools of K (Available K, Nitric acid soluble K and Non-exchangeable K) are significantly and positively correlated (r = 0.186*, r = 0.201* and r = 0.182*, respectively ) in North Bihar. Non-exchangeable K is significantly and negatively correlated with soil pH (r = - 0.225*). Nitric acid soluble K was significantly and negatively correlated with pH (r = - 0.237**) and cation exchange capacity (r = - 0.253**); non-exchangeable Potassium was significantly and negatively correlated with cation exchange capacity (r = - 0.271**). Spatial distribution of pools of potassium generated on the basis of interpolation of point data provides spatial information for potassium management in North Bihar. Soil map generated by combination of exchangeable and non-exchangeable K of soil into nine classes among which, Class I , Class II, Class IV and Class VII cumulatively cover 45.23 % area comprising in Motihari, Bettiah, Jaynagar, Sitamarhi, Darbhanga, Kisanganj, Purnia and Araria districts of North Bihar, where K application must be done to realize full yield potential of different cropping systems.
Subject: Soil Sciences
Theme: To assess different pools of K in soils of North Bihar
These Type: M.Sc
Issue Date: 2017
Appears in Collections:Thesis

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