Effect of Continuous Fertilization And Cropping on Phosphate Supplying Power of Acid Soil
| dc.contributor.advisor | Dr. N.C.Srivastava | |
| dc.contributor.author | Jamardan Prasad | |
| dc.date.accessioned | 2024-06-10T14:09:00Z | |
| dc.date.available | 2024-06-10T14:09:00Z | |
| dc.date.issued | 1993 | |
| dc.description.abstract | A continuous application of fertilizer or manure in the same field with a common cropping sequence may develop specific problems in soil and crop management. The problem was first studied by Hardpenden in England during 1848 followed by many such trials on global basis. Considering the problems in Indian soils, a more methodical approach was launched by ICAR (Indian Council of Agri cultural Research) as All India Coordinated Research Project in different agro-ecological zones to assess the impact of long term fertilization and cropping. At Ranchi LTE (Long Term Fertilization) experiment of ICAR was initiated in 1972-73 and the present study has been made to assess the changes in soil properties and to study P-indices and P supplying power of soils as a result of continuous fertilization and cropping in the same plots. Soil pH and organic carbon status decreased, in general, compared to initial status. Treatments receiving11me and FM however, showed a higher value. Cation exchange capacity, Exch. Ca and Mg, dvailable NPK status also increased, in general, with more increase in treatments receiving lime and FW. A slight decrease was observed in case of Ammonium sulphate as N source. Percentage Base Saturation and 1ime potential followed the similar trend with maximum increase in 1ime treatment followed by FYA. The total P status increased in all the treatments exhibiting a cumulative effect of P depending upon the level of its application. Maximum P was observed with FMI at 100% NPK level showing the impact of organic matter. Available P was extracted through Bray P₁. Bray Pa and Olsen's method and maximum extraction was with Bray P2 and least with Olson's method. Regression equations developed between yield/P uptake and available P in soil indicated a similar trend. Least Avail P was observed with treatment receiving N only or N applied as ammonium sulphate. The available P status, sorted out at an average interval of five years, indicated a gradual accumulation as cumulative effect following the similar trend as during 1991/92. Different forms of P exhibited the sequence of Fe-P, Al-P, Ca-P, Red-P, Saloid P, in general, with the exception of line treatment where Ca-P dominated. Regresaion equation between yield/P uptake and P fractions indicated similar trend with significance of saloid-P and Ca-P. A graded level of P applied with six selected treatments indicated more available P increasing with increasing levels of P, though not in proportion. Maximum available P observed with 100% NPK+FYM followed by 100% NPK+L only indicating the surface area effect and minimum with 100% N applied as ammonium sulphate. Adsorption studies indicated increased adsorption with all the graded levels and with all the treat ments. Maximum adsorption was found with control. P in soil solution after adsorption indicated maximum value in FYM treated plots followed by lime treatments though with comparatively less adsorption compared to control. The adsorption maxima and bonding energy constants of Langmuir adsorption followed the similar trend. Maximum values were obtained with control followed by 100% NP+W 100%. and, NPK+L+W, Buffering capacity of soils due to graded P was maximum with control followed by N treatment and both followed the similar trend. Desorption of P at different time interval indicated maximum desorption in treatments receiving NPK+FWM followed by NPK+Lime & NPK only indicating the effect on the available P. However more P could be released during the initial period compared to later part. Desorption behavior studied with graded P using Anion Exchange Resin indicated maximum desorption with treatments receiving NPK+ FYM followed by NPK+L and the NPK only indicating P availability. Studies on the impact of continuous application of fertilization and cropping on soil properties and P indices indicated that yield and P uptake are significantly correlated with organic carbon, CEC, Exch. Ca and Mg and available P of the soil. The adsorption and desorption too are correlated with organic matter and lime giving more P retention and release for plant use. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810210343 | |
| dc.language.iso | English | |
| dc.pages | 129 | |
| dc.publisher | Birsa Agricultural University, Ranchi | |
| dc.sub | Soil Science and Agriculture Chemistry | |
| dc.theme | Effect of Continuous Fertilization And Cropping on Phosphate Supplying Power of Acid Soil | |
| dc.these.type | M.Sc | |
| dc.title | Effect of Continuous Fertilization And Cropping on Phosphate Supplying Power of Acid Soil | |
| dc.type | Thesis |