Soil quality assessment and evaluation of rejuvenation strategies for coastal sandy soils of thiruvanathapuram district (AEU 1) through organics (Record no. 291105)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 07587nam a22002057a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 631.4 |
| Item number | ATH/SO PG |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Athulya, B M |
| 245 ## - TITLE STATEMENT | |
| Title | Soil quality assessment and evaluation of rejuvenation strategies for coastal sandy soils of thiruvanathapuram district (AEU 1) through organics |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellayani |
| Name of publisher, distributor, etc | Department of soil science and agricultural chemistry, college of agriculture |
| Date of publication, distribution, etc | 2023 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 197p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 ## - SUMMARY, ETC. | |
| Abstract | A study entitled “Soil quality assessment and rejuvenation of coastal sandy soils of Thiruvananthapuram district (AEU 1) through organics” was carried out with an objective in assessment of soil quality of coastal sandy soils in Thiruvananthapuram district (AEU 1) and development of organics based rejuvenation methods. The study was carried out in two phases. As phase 1, characterization of southern coastal soils of AEU 1 in Thiruvananthapuram district was done. Based on the results of phase I, an area with low fertility was selected for phase 2 of the study. Different organic amendments were applied to study the effect on soil properties and crop growth in phase 2. Fifty geo-referenced surface soil samples, along with core samples were collected from coastal areas in AEU 1 of Thiruvananthapuram district and characterized for various physical (texture, bulk density, particle density, water holding capacity and soil aggregate stability), chemical (pH, EC, cation exchange capacity, exchangeable acidity, organic carbon, available macronutrients, available micronutrients such as Fe, Mn, Zn, Cu, B, Cl, Na and heavy metals (Pb and Cd)) and biological attributes (dehydrogenase activity and microbial biomass carbon). Principal component analysis was used to set up the minimum data set of indicators to compute the soil quality index. Six principal components were extracted from which ten indicators that highly influenced the soil quality were identified, viz. clay per cent, water holding capacity, bulk density, soil pH, organic carbon, available K, available S, available Zn, available Mn and available B. Scores and weights were assigned to each indicator, and were aggregated to compute the soil quality index. The relative soil quality index of the soils were also found. GIS techniques were used to prepare thematic maps of major soil attributes and relative soil quality indices of the coastal sandy soils of AEU 1. Correlations were worked out among the various analysed parameters. The analytical results for soil physical properties showed that the predominant soil textual class observed in the present study area was sand and loamy sand. Bulk 192 density was in the range of 1.37 - 1.86 Mg m- ³, particle density 2.22 - 2.89 Mg m- ³, with 22.7 – 56 per cent water holding capacity and 33.6-59.4 per cent soil aggregate stability. The soil pH ranged between 5.11 - 7.19, and 0.03 - 0.23 dS m-1 for electrical conductivity. Organic carbon was found in the range of 0.07 - 1.01 per cent, nitrogen 100 - 308 kg ha-1 , phosphorus 7.05 - 59.94 kg ha-1 and potassium 100 - 361 kg ha-1 . Secondary nutrients ranged as: calcium 80 - 360 mg kg-1 , magnesium 47 - 152 mg kg-1 and sulphur 4.5 - 20.5 mg kg-1 . The available micro nutrients ranged between: 6.63 - 81.57 mg kg-1 for iron, 2.53 - 36.01 mg kg-1 for manganese, 2.21 - 16.64 mg kg-1 for zinc, 0.11 - 6.07 mg kg-1 for copper and 0.11- 0.82 mg kg-1 for boron. Heavy metals such as Cd and Pb were below detectable limit. Soil biological activity in these soils were poor with dehydrogenase activity in the range of 5.57 – 20.29 µg TPF hydrolysed g-1 soil 24 hrs-1 and microbial biomass carbon of 9.18 - 29.96 µg g1 soil. So, generally the fertility status of this coastal sandy soils was found to be low. Majority of the soils belonged to medium soil quality (60 %), followed by good (36 %) and poor (4 %) quality. The soils of Kadakkavoor recorded the highest soil quality index and that of Anchuthengu, recorded the lowest. Based on the results of phase I, a pot culture experiment was done at Kochuveli, Industrial area, Thiruvananthapuram with Amaranthus (variety: Arun) as test crop. The experiment was completely randomized design (CRD) with 12 treatments and 3 replications. In the pot culture experiment, treatments included were; T1: Control, T2: Organic POP, T3 : Vermicompost, T4: Liming + Vermicompost, T5 : Coir pith compost, T6: Liming + Coir pith compost, T7: City compost, T8: Liming + City compost, T9: Suchitha, T10: Liming + Suchitha, T11: FYM 12.5 t ha-1 + Biochar 12.5 t ha-1 , T12: Liming + FYM 12.5 t ha-1 + Biochar 12.5 t ha-1 . In T2 (organic POP), FYM @ 25t ha-1 as basal dose and top dressing with fresh cow dung slurry @ 1kg per 10 litres (50 kg ha-1 ) was done. Along with that, 272.7 kg rock phosphate and 122.5 kg potassium sulphate ha-1 were applied. From T3 to T10, as per organic POP manure recommendation, basal dose of FYM was substituted with organic amendments @ 25 t ha-1 with or without lime application. 193 Soil management using organic manures had considerable impact on growth and yield characteristics of plant. Highest plant height was observed in T8, which was on par with T4 and T10. Highest dry matter and yield were recorded in T10 which was followed by T4. Effect of organic manures on quality parameters showed that highest β carotene and nitrate content were recorded in T10. Highest vitamin C content was recorded in T10 which was on par with T3 and T4. Being an antinutritional factor, T1 recorded the highest value of oxalate content and the lowest was seen in T10. Regarding the nutrient uptake in plants, T10 recorded the highest uptake of N, K, Ca and Mg, while T4 recorded the highest in P and S uptake. Analyses of post-harvest soil for nutrient parameters showed that the highest value of organic carbon was recorded in T10, which was on par with T8 and T9. The highest value for available nitrogen was recorded for T10 while the highest value for available phosphorous was recorded in T4. The potassium content was found to be the highest in T10. Also T10 showed the highest value in available secondary nutrients. Micronutrients analyses showed that highest content of available Fe was present in T3, while highest of available Cu, Zn and B were recorded in T10. T9 showed the highest value in available Mn. T1 showed highest available Na and Cl content. Analyses of soil biological properties due to the effect of organic manure addition showed that the highest value of dehydrogenase activity was found in T8, which was statistically on par with T7 and T10. Also, the highest value in microbial biomass carbon was found in T8, which was on par with T7, T9, and T10. The highest B: C ratio was recorded by T10. From the study, it is concluded that soil test based lime application and basal application of Suchitha @ 25 t ha-1 , top dressing with fresh cow dung slurry @ 1kg per 10 litres, along with 272.7 kg rock phosphate and 122.5 kg potassium sulphate ha-1 was observed to be the best treatment to improve the soil quality, yield and quality parameters of amaranthus in coastal sandy soils of AEU 1 in Thiruvananthapuram district. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Soil quality index |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Physical, chemical, and biological analysis of soil |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Agro-ecological unit |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Soil science |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Agricultural chemistry |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Gowri Priya (Guide) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Item type | Theses |
| Not for loan | Collection code | Permanent location | Current location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Not For Loan | Thesis | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2024-03-19 | 631.4 ATH/SO PG | 175948 | 2024-03-19 | Theses |