Geospatial variability and nutrient dynamics of soils of lateritic wetlands vis-avis coastal wetlands
Anzala Shahanas
Geospatial variability and nutrient dynamics of soils of lateritic wetlands vis-avis coastal wetlands - Padanakkad Department of Soil Science & Agricultural Chemistry, College of Agriculture 2025 - i-viii, 130p.
MSc
A research study entitled “Geospatial variability and nutrient dynamics of soils of lateritic wetlands vis-a-vis coastal wetlands” was done with the objective to assess the spatial and temporal variability of the wetland soils in the two AEU’s (northern laterites and northern coastal plains) of north Kerala using GIS and also to assess the soil dynamics as modified by amendments for evolving best management practices.
Paddy growing wetland of RARS, Pilicode (AEU 11) and Muppathil kandam at Nileshwar (AEU 2) were selected for the spatial and temporal variability assessment of soil nutrient dynamics. Grid based soil samples were collected from 10 locations at quarterly intervals for one year from these wetlands (from February 2023 to November 2023). Additionally, a pot culture experiment was conducted at the College of Agriculture, Padannakkad, using paddy as the test crop. Experiment was conducted with 2 types of soils (coastal sandy and lateritic alluvial wetland) under 5 levels of treatments using CRD. Treatment combinations were T1 (KAU POP (2016) based fertilizers + lime), T2 (Soil test based fertilizers), T3 (Soil test based fertilisers and lime), T4 (KAU organic POP based FYM + Lime) and T5 (Soil test based fertilisers and dolomite).
In the clay loam soils of lateritic wetland (AEU 11), pH was found to be in the range of 4.44 to 5.64 and were non saline. Organic C content ranged from 0.60 % to 2.85 % and available N ranged from 81.54 to 476.67 kg ha⁻¹. Available P was high (>29 kg ha⁻¹) and available K ranged from 56.22 to 263.65 kg ha⁻¹. Available Ca varied between 160.00 and 480 mg kg⁻¹ and available Mg varied between 48.00 and 156.00 mg kg⁻¹. Available S, Fe, Mn, Zn and Cu content were sufficient and available B was deficient. MBC varied between 216.97 and 1390.59 μg g⁻¹ and DHA varied between 1.28 and 13.59 μg TPF released g⁻¹ soil 24 h⁻¹. . In the coastal sandy wetland soils (AEU 2), pH ranged from 5.60 to 6.94 and were non saline. Organic C was in the range from 0.45 % to 1.20 % and available N ranged from 43.90 to 244.61 kg ha⁻¹. Available P was high (>29 kg ha⁻¹) and available K was low to medium (15.68 and 210.13 kg ha⁻¹). Available Ca varied between 160.00 and 480 mg kg⁻¹ and available Mg varied between 72 and 192 mg kg⁻¹. Available S, Fe, Mn, Zn and Cu content were sufficient and available B was deficient. MBC ranged between 54.59 and 338.66 μg g⁻¹ and DHA ranged between 0.65 and 9.66 μg TPF released g⁻¹ soil 24 h⁻¹.
On assessing the temporal variability of nutrient dynamics in lateritic wetland soils, it was found that the mean organic C, available Ca and Mg content were highest in August which was on par with May. The mean available S, MBC and DHA were highest in August. The highest mean available N was observed in November, while the mean available P was maximum in August, which was on par with November and May. In coastal wetland soils, the highest mean value of organic C, available N, K, mean MBC and DHA were recorded in November. The mean available Ca, Mg and S were highest in May which was on par with August and mean available P was highest in February. In both wetland soils, the highest mean pH value was observed in May which was on par with February.
Results of pot culture experiment showed that there is significant effect of treatments on soil nutrient content and plant growth. Treatments have no significant effect on plant height. In lateritic wetland soils, highest number of productive tillers was recorded in T5 which was on par with T3 and T2. Highest number of grains per panicle was recorded in T3 which was on par with T5 and T2. Highest 1000 grain weight was recorded in T3 which was on par with T5. In coastal wetland soils, number of productive tillers was maximum in T3 which was on par with T5 and T2. Number of grains per panicle was maximum in T5 which was on par with T3 and T2. Highest 1000 grain weight was recorded in T5 which was on par with T3.
Available N, K, Ca, Mg and B showed similar trend in both lateritic and coastal wetland soils. Available N was maximum in T1 and available K was maximum in T3 which was on par with T2 and T5. Highest available Ca was recorded in T1 which was on par with T4 and T3. Highest available Mg was recorded in T3 which was on par with T5 and T2. Highest available B was recorded in T3 which was on par with T5 and T2.
Total nutrient content in plants (N, Ca, Mg, S and B) showed similar trend in both soil types. Highest plant N content was recorded in T1 which was on par with T3 and T5. Highest plant Ca and S content were recorded in T1 which was on par with T4. Highest Mg content was recorded in T3 which was on par with T5 and T2. Plant B content was maximum in T3 which was on par with T5. Highest plant K content was recorded in T3 in lateritic wetland soils while it was maximum in T3 which was on par with T5 in coastal wetland soils.
Agricultural Chemistry
Geospatial variability
Soil Science
631.4 / ANZ/GE PG
Geospatial variability and nutrient dynamics of soils of lateritic wetlands vis-avis coastal wetlands - Padanakkad Department of Soil Science & Agricultural Chemistry, College of Agriculture 2025 - i-viii, 130p.
MSc
A research study entitled “Geospatial variability and nutrient dynamics of soils of lateritic wetlands vis-a-vis coastal wetlands” was done with the objective to assess the spatial and temporal variability of the wetland soils in the two AEU’s (northern laterites and northern coastal plains) of north Kerala using GIS and also to assess the soil dynamics as modified by amendments for evolving best management practices.
Paddy growing wetland of RARS, Pilicode (AEU 11) and Muppathil kandam at Nileshwar (AEU 2) were selected for the spatial and temporal variability assessment of soil nutrient dynamics. Grid based soil samples were collected from 10 locations at quarterly intervals for one year from these wetlands (from February 2023 to November 2023). Additionally, a pot culture experiment was conducted at the College of Agriculture, Padannakkad, using paddy as the test crop. Experiment was conducted with 2 types of soils (coastal sandy and lateritic alluvial wetland) under 5 levels of treatments using CRD. Treatment combinations were T1 (KAU POP (2016) based fertilizers + lime), T2 (Soil test based fertilizers), T3 (Soil test based fertilisers and lime), T4 (KAU organic POP based FYM + Lime) and T5 (Soil test based fertilisers and dolomite).
In the clay loam soils of lateritic wetland (AEU 11), pH was found to be in the range of 4.44 to 5.64 and were non saline. Organic C content ranged from 0.60 % to 2.85 % and available N ranged from 81.54 to 476.67 kg ha⁻¹. Available P was high (>29 kg ha⁻¹) and available K ranged from 56.22 to 263.65 kg ha⁻¹. Available Ca varied between 160.00 and 480 mg kg⁻¹ and available Mg varied between 48.00 and 156.00 mg kg⁻¹. Available S, Fe, Mn, Zn and Cu content were sufficient and available B was deficient. MBC varied between 216.97 and 1390.59 μg g⁻¹ and DHA varied between 1.28 and 13.59 μg TPF released g⁻¹ soil 24 h⁻¹. . In the coastal sandy wetland soils (AEU 2), pH ranged from 5.60 to 6.94 and were non saline. Organic C was in the range from 0.45 % to 1.20 % and available N ranged from 43.90 to 244.61 kg ha⁻¹. Available P was high (>29 kg ha⁻¹) and available K was low to medium (15.68 and 210.13 kg ha⁻¹). Available Ca varied between 160.00 and 480 mg kg⁻¹ and available Mg varied between 72 and 192 mg kg⁻¹. Available S, Fe, Mn, Zn and Cu content were sufficient and available B was deficient. MBC ranged between 54.59 and 338.66 μg g⁻¹ and DHA ranged between 0.65 and 9.66 μg TPF released g⁻¹ soil 24 h⁻¹.
On assessing the temporal variability of nutrient dynamics in lateritic wetland soils, it was found that the mean organic C, available Ca and Mg content were highest in August which was on par with May. The mean available S, MBC and DHA were highest in August. The highest mean available N was observed in November, while the mean available P was maximum in August, which was on par with November and May. In coastal wetland soils, the highest mean value of organic C, available N, K, mean MBC and DHA were recorded in November. The mean available Ca, Mg and S were highest in May which was on par with August and mean available P was highest in February. In both wetland soils, the highest mean pH value was observed in May which was on par with February.
Results of pot culture experiment showed that there is significant effect of treatments on soil nutrient content and plant growth. Treatments have no significant effect on plant height. In lateritic wetland soils, highest number of productive tillers was recorded in T5 which was on par with T3 and T2. Highest number of grains per panicle was recorded in T3 which was on par with T5 and T2. Highest 1000 grain weight was recorded in T3 which was on par with T5. In coastal wetland soils, number of productive tillers was maximum in T3 which was on par with T5 and T2. Number of grains per panicle was maximum in T5 which was on par with T3 and T2. Highest 1000 grain weight was recorded in T5 which was on par with T3.
Available N, K, Ca, Mg and B showed similar trend in both lateritic and coastal wetland soils. Available N was maximum in T1 and available K was maximum in T3 which was on par with T2 and T5. Highest available Ca was recorded in T1 which was on par with T4 and T3. Highest available Mg was recorded in T3 which was on par with T5 and T2. Highest available B was recorded in T3 which was on par with T5 and T2.
Total nutrient content in plants (N, Ca, Mg, S and B) showed similar trend in both soil types. Highest plant N content was recorded in T1 which was on par with T3 and T5. Highest plant Ca and S content were recorded in T1 which was on par with T4. Highest Mg content was recorded in T3 which was on par with T5 and T2. Plant B content was maximum in T3 which was on par with T5. Highest plant K content was recorded in T3 in lateritic wetland soils while it was maximum in T3 which was on par with T5 in coastal wetland soils.
Agricultural Chemistry
Geospatial variability
Soil Science
631.4 / ANZ/GE PG