SOIL STRUCTURE AND ORGANIC CARBON STABILITY OF RAINFED ALFISOLS UNDER LONG-TERM APPLICATION OF MANURE AND FERTILIZERS
| dc.contributor.advisor | Dr. M. MADHAN MOHAN | |
| dc.contributor.author | HEMANTH. C.C | |
| dc.date.accessioned | 2024-05-22T11:29:18Z | |
| dc.date.available | 2024-05-22T11:29:18Z | |
| dc.date.issued | 2024-05-22 | |
| dc.description.abstract | The present study entitled “SOIL STRUCTURE AND ORGANIC CARBON STABILITY OF RAINFED ALFISOLS UNDER LONG-TERM APPLICATION OF MANURE AND FERTILIZERS” was carried out as part of the long-term experiment during kharif, 2021 on red sandy loam (Haplustalf) soils at Regional Agricultural Research Station, Acharya N.G Ranga Agricultural University, Tirupati, Andhra Pradesh. The experiment was laid out in randomized block design with eleven treatments and four replications. The treatments includes T1: control (no manure and fertilizers), T2: Farm yard manure @ 5 t ha-1 (once in 3 years), T3: 20 kg nitrogen (N) ha-1, T4: 10 kg phosphorus (P) ha-1, T5: 25 kg potassium (K) ha-1, T6: 250 kg gypsum ha-1, T7: 20 kg N + 10 kg P ha-1, T8: 20 kg N + 10 kg P + 25 kg K ha-1, T9: 20 kg N + 10 kg P + 25 kg K + 250 kg gypsum ha-1, T10: 20 kg N + 10 kg P + 25 kg K + 100 kg lime ha-1, T11: 20 kg N + 10 kg P + 25 kg K + 250 kg gypsum + 25 kg ha-1 zinc sulphate (once in 3 years). Soil samples were collected from each treatment at two depths viz., 0-15 and 15-30 cm after harvest of crop during kharif, 2021. The data was recorded on soil physical, physio-chemical properties along with yield and yield attributing characters. The physical properties viz., bulk density, porosity, maximum water holding capacity and structural indices viz., mean weight diameter, geometric mean diameter, per cent water stable aggregates (>0.25 mm) and per cent aggregate stability were improved by the long-term application of FYM @ 5 t ha-1 (T2) once in three years for the past 41 years compared to other treatments. xvi The treatmental combinations viz., NPK+gypsum+ZnSO4 (T11), NPK+lime (T10), NPK+gypsum (T9) and NPK (T8) were showed improvement in soil physical properties viz., bulk density, porosity, water holding capacity and structural indices compared to the control, whereas long-term application of K fertilizers alone showed deterioration in soil physical properties compared to the control. Long-term application of manure and fertilizers to groundnut showed a slight decrease in soil pH compared to initial soil pH recorded during 1981. Whereas the accumulation of salts was not observed over a period of 41 years of experimentation in surface and sub-surface layers. However, soil organic carbon (SOC) content was improved in all the treatments including control over 41 years of cropping and application of manure and fertilizers. However the SOC was higher at surface layer than sub-surface layer in all the treatments. Long-term application of FYM @ 5 t ha-1 (T2) once in three years was recorded significantly highest SOC stocks, build-up (%) and carbon sequestration rate at surface and sub-surface layers and which was comparable with other treatmental combinations viz., NPK+gypsum+ZnSO4 (T11), NPK+lime (T10), NPK+gypsum (T9) and NPK (T8). Whereas the application of single nutrient fertilizers viz., N alone (T3), P alone (T4) and K alone (T5) treated plot showed negative SOC stock build-up (%) compared to control in both the soil layers. Soil aggregate fractions under long-term application of FYM @ 5 t ha-1 (T2) and treatmental combinations viz., NPK+gypsum+ZnSO4 (T11), NPK+lime (T10) and NPK+gypsum (T9) were showed significantly higher proportion of large and small macro-aggregates fractions compared to control. Whereas, single nutrient fertilizer treatments showed higher micro-aggregates fractions. The aggregate associated-C was significantly higher in large macro aggregates compared to small macro and micro-aggregate fractions in both the soil layers. However, aggregate associated-C was higher in surface layer compared to sub-surface layer. The significantly highest pod and haulm yields were recorded with FYM alone (T2) and NPK+gypsum+ZnSO4 (T11), respectively compared to all other treatments. However, comparable with other treatments viz., NPK+lime, NPK+gypsum and NPK treated plots. The treatments received with single nutrient fertilizers viz., N or P or K alone were inferior interms of soil structure, organic carbon stability and pod yield as compared to the combined application of nutrients. The study clearly indicated that application of FYM and treatmental combinations viz., NPK+lime, NPK+gypsum+ZnSO4 and NPK+gypsum would be better for the improvement of soil structure, organic carbon stability and groundnut pod yield on sustainable basis. | |
| dc.identifier.other | D6577 | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810209358 | |
| dc.keywords | SOIL STRUCTURE | |
| dc.keywords | ORGANIC CARBON STABILITY | |
| dc.keywords | RAINFED ALFISOLS | |
| dc.keywords | LONG-TERM APPLICATION | |
| dc.keywords | FERTILIZERS | |
| dc.language.iso | English | |
| dc.pages | 162 | |
| dc.publisher | Acharya N G Ranga Agricultural University | |
| dc.relation.ispartofseries | D6577; D6577 | |
| dc.sub | Soil Science and Agriculture Chemistry | |
| dc.theme | SOIL STRUCTURE AND ORGANIC CARBON STABILITY OF RAINFED ALFISOLS UNDER LONG-TERM APPLICATION OF MANURE AND FERTILIZERS | |
| dc.these.type | M.Sc | |
| dc.title | SOIL STRUCTURE AND ORGANIC CARBON STABILITY OF RAINFED ALFISOLS UNDER LONG-TERM APPLICATION OF MANURE AND FERTILIZERS | |
| dc.type | Thesis |