Nitrogen Transformations In Acid Alfisols Of Ranchi Under Continuous Manuring And Fertilization
| dc.contributor.advisor | B.S.Mathur | |
| dc.contributor.author | Rajendra Pratap Singh | |
| dc.date.accessioned | 2024-06-22T14:23:47Z | |
| dc.date.available | 2024-06-22T14:23:47Z | |
| dc.date.issued | 1990 | |
| dc.description.abstract | Influence of continuous cropping of maize followed by wheat, fertilization and manuring for the last 31 years on the nitrogen transformations in a sedentary acid red loan mixed hyperthermia typic haplustalf soil was studied. Results reveal that 10 to 16% of total N in the surface soil was in the form of NH-N, 14 to 23% as bound amino acid, 4.6 to 8.3% in serine+threonine and 1.8 to 3.8% as amino sugar. Continuous cropping caused a marked depletion in all the hydrolysable nitrogen fractions compared to the adjacent uncropped soil. Monitoring the reversion of different nitro gen fractions within last ten years indicate a depletion in all the hydrolysable N forms in the order: Hydrolysable + NH (19.3) > Hencosamine (17.3) > Serine+threonine-N (14.8)) Total hydrolysable N (13.1)) Hydrolysable unidentified N (10.6) amino acid-N (5.7). Continuous cropping with application of ammonium sulphate alone showed a decline in amino, unidentified and total hydrolysable nitrogen fractions. Inclusion of phosphates along with nitrogen caused an increase in hexose and non-hydrolysable nitrogen while balanced application of NPK kept the amino-N at a higher level. Balanced application of NPK supplemented with lime caused a depletion of hydrolysable ammonium and an accumulation of serine+threonine and hexosamine form of nitrogen. Organic manuring kept the amino as well as serine+threonine nitrogen at a higher level. Hexamine as well as serine+threonine nitrogen were found to correlate significantly and positively with grain yield of maize. Multiple linear regression analysis suggested a greater dependability of yield of both the crops in sequence on serine+threonine, amino and hydroly sable unidentified nitrogen fractions of soil nitrogen. Incubating the soils of differently fertilized plots where acidity had developed, liming resulted in a significant decline of hydrolysable NH and amino nitrogen + with accompanying increase in hexose, serine+threonine and total hydrolysable nitrogen forms. Rate of nitrification in N, P, K treated plots were relatively slow. Organics alone or in conjunction with fertilizer and/or lime resulted in the enhancement of the rate of nitrification with lower delay period. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810210774 | |
| dc.language.iso | English | |
| dc.pages | 197 | |
| dc.publisher | Birsa Agricultural University, Ranchi | |
| dc.sub | Soil Science and Agriculture Chemistry | |
| dc.theme | Nitrogen Transformations In Acid Alfisols Of Ranchi Under Continuous Manuring And Fertilization | |
| dc.these.type | Ph.D | |
| dc.title | Nitrogen Transformations In Acid Alfisols Of Ranchi Under Continuous Manuring And Fertilization | |
| dc.type | Thesis |