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PH (Puissance de Hydrogen) is an essential ingredient of soil that effects on fertility and productivity of dirt. Barddhaman district is a part of Lower Gangetic Plain fully covered by alluvial soil and popularly known as ‘rice bowl of West Bengal’ owing to its lofty production. This data article provides a block level data on soil PH that is essential for further investigation of the relationship among soil ph, plant growth, plant health and productivity. This data is valuable in the field of soil geography and soil science. Soil PH data is more relevant in the ground of plant biology, agricultural geography and agricultural science. It helps to explain the acidic and alkaline nature of alluvial soil. The data consist of 195 samples (n=195) taken from the entire district. Samples have been collected from March, 2014 to March, 2015 and experimented in the laboratory. Theoretically PH value is limited within 0–14. Experiment result exemplifies the highest value 8.5 found in Khandaghosh block whereas lowest value is 4.5 and the samples which result in lowest value are gathered from 4 different blocks like Manteswar, Burdwan - II, Barabani and Salanpur.
Value of the data
Barddhaman district is broadly divided into two parts – north western part is known as industrial belt and eastern part is recognized as agricultural belt. The data presented here describes the soil PH level of 39 different administrative units of the entire district. Data is given both in table and figure form and an excel data is also added in Supplementary material of the data article. The data is prepared on the basis of field work and laboratory experiment.
Barddhaman district is covered by 39 administrative units divided into 31 blocks, 6 municipalities and 2 municipal corporations. 5 samples are taken from each administrative area and the total number of sample n=195 (39×5=195). Sampling is designed on three different periods over the year – (a) Pre-monsoon period (March to mid June), (b) monsoon period (mid June to September) and (c) post-monsoon period (October to February) to observe the seasonal variation of PH level. Two samples are taken in the pre-monsoon period, one sample in monsoon period and another two samples in post-monsoon period from each unit. A good sample is very much important for beneficial result. Samples are randomly collected giving emphasis on agricultural land and forest area. To ignore the exposed layer samples are gathered in depth of 25 cm from the soil surface which conserve the natural properties of it .
Clean plastic containers are used to preserve the collected soil. Location coordinates of the sampling sites are acquired by the handheld GPS and projected on the georeferenced map made by the Arc GIS 9.3 version software (the permission for using the software is granted by the authority of The University of Burdwan) (Fig. 1). Collected raw materials are dried up for 7 days on the air temperature. Fine and dusty particles are prepared for laboratory experiment through pasting and filtering process respectively.
Experiment results are entered in sheet 1 of an excel file individually. Result of 5 samples for each administrative unit is converted into an average value. Average value is rounded in the nearest round figure of 0.5 intervals. Table and figure form of data are presented in the article (Table 1 and Fig. 3) and excel data is also available with it (Supplementary file).
Soil PH is a crucial soil indicator and is defined as the negative log of the hydrogen ion activity . The determination of soil PH in soil is important as it plays a great role in availability of nutrients to plants . Different PH range indicates different types of acidic and alkaline soil  (Table 2).
Author wish to thank Dr. Bhupendra Nath Dutta Smriti Mahavidyalaya, Burdwan for giving permission to use the laboratory. Thanks are also given to the students of geography department of that college for their valuable and reliable assistance in sample collection. I acknowledge my gratitude to Poulami Ganguly for correction and improvement of the language. The author would like to thank two anonymous reviewers for their comments on the manuscript.