Exploration for natural resources and their utilization are present ever since the existence of human civilization. In India, land and water resources are the two important ones which determine our development. We possess large geographical area of 329 M.ha and unfortunately, nearly half of it is characterized with low soil fertility. Thus, nutrient limitation is an issue of concern in these marginal lands and several initiatives have been made in the past on their improvement. In contrast, we are also seeing nutrient surplus situations, sometimes even toxicities, in urban areas due to domestic and industrial waste disposals. Chemically, these wastes are organic in nature and rich in plant nutrients. An attempt was made to match these contrasting situations i.e. application of nutrient rich organic wastes to meet the nutrient requirements of tree species planted on less fertile wastelands. Thus, the objectives of the experiment were,
- To characterize the wastelands in terms of physical and chemical features as soil limiting factors in afforestation programme
- To characterize domestic and agro-industrial organic wastes for suitability as nutrient source in afforestation programme
- To evaluate the changes in physical and chemical properties of wasteland soils due to organic wastes application
- To evaluate the growth performance of tree species due to organic wastes application in wastelands
Table of Contents
I. INTRODUCTION
II. REVIEW OF LITERATURE
2.1. Wastelands: Definition and Features
2.2. Extent of Wastelands
2.3. Categories / Forms of Wastelands
2.4. Features of Eroded Lands
2.4.1. Physical Features
2.4.2. Chemical features
2.4.3. Ecological features
2.5. Need for Wasteland Reclamation
2.6. Strategies for Wasteland Restoration
2.6.1. Physical Restoration
2.6.2. Chemical Restoration
2.6.3. Biological Restoration
2.7. Organic Wastes as Nutrient Sources in Wastelands Reclamation
2.7.1. Quantum of Production of Organic Wastes
2.7.2. Waste Disposal through Land Application
2.7.3. Organic Wastes as Source of Nutrients
2.7.4. Heavy Metals Contamination with Wastes Application
2.7.5. Changes in Soil Physical Properties with Organic Wastes Application
2.7.6. Changes in Soil Chemical Properties with Organic Waste Application
2.7.7. Changes in Soil Biological Properties with Organic Wastes Application
2.8. Afforestation in Wastelands a Viable Option?
2.9. Suitability of Forest Tree Species
2.10. Wasteland Restoration Programmes in India
III. MATERIAL AND METHODS
3.1. Characterization of Wastelands
3.1.1. Selection of Wasteland Sites
3.1.2. Soil Samples Collection
3.1.3. Soil Physical Analysis
3.1.4. Soil Chemical Analysis
3.1.5. Dilution Effects of Coarse Fragments
3.2. Characterization of Organic Wastes
3.2.1. Collection of Organic Wastes (Sludges)
3.2.2. Nutrient Content of Organic Wastes
3.3. Field Experiments Using Organic Wastes
3.4. Monitoring of Changes in Soil Properties
3.5. Statistical Analysis
IV. EXPERIMENTAL RESULTS
4.1. Characterization of Wastelands
4.2. Characterization of Organic Wastes
4.3. Influence of Organic Wastes and their Performance in Field Experiment
4.3.1. Species Growth Performance with Organic Wastes Application
4.3.2. Soil Physico-chemical Characteristics
4.3.2.1. Soil Electro – chemical Properties and Organic- C content
4.3.2.2. Major Nutrients
4.3.2.3. Secondary Nutrients
4.3.2.4. Micronutrients
4.3.2.5. Heavy Metals
4.3.2.6. Soil Physical Parameters
V. DISCUSSION
5.1. Characterization of Wastelands
5.2. Characterization of Organic Wastes
5.3. Direct Application of Organic Wastes
5.3.1. Influence of Organic Wastes and their Performance in Field Experiment
5.3.1.1. Species growth Performance with organic wastes Application
5.3.1.2. Soil Physico-chemical Characteristics
5.3.1.2.1. Electro – chemical Properties and Organic- C Content of Soil
5.3.1.2.2. Major Nutrients
5.3.1.2.3. Secondary Nutrients
5.3.1.2.4. Micronutrients
5.3.1.2.5. Heavy Metals
5.3.1.2.6. Soil Physical Properties
VI. SUMMARY
Research Objectives and Focus
This study evaluates the potential of using nutrient-rich organic wastes from urban and industrial sectors to reclaim nutrient-depleted wastelands in India. The research aims to assess how the application of these organic amendments improves soil physical and chemical properties and enhances the growth performance of selected tree species under wasteland conditions.
- Characterization of wastelands based on their physical and chemical limitations for afforestation.
- Evaluation of various domestic and agro-industrial organic wastes as nutrient sources.
- Assessment of changes in wasteland soil properties following the application of organic wastes at different levels.
- Determination of the growth performance of specific tree species in response to organic waste application.
- Investigation into potential heavy metal accumulation risks associated with land application of industrial wastes.
Excerpt from the Book
2.4.1. Physical Features
Poor soil structure, high bulk density, less pore space, shallow depth, steep slope, low productivity, high leaching, stoniness are some of the important physical features of degraded lands (Bernard, 1982). The loss of soil fines namely clay, silt and organic matter along with runoff water have resulted in physical degradation. The loss of organic matter decreases the aggregate stability and hence the soil structure (Tisdale et al., 1978; Bhatia and Vardani, 1982). The soil moisture characteristics - water holding capacity, infiltration rate, available soil moisture content etc are also severely influenced in these soils (Atkinson et al., 1991). Generally, the bulk density of a typical red soil is 1.30 g cc-1 whereas the physically degraded lands dominated with coarse fragments possess a bulk density value of 1.6 + 0.15 g cc-1 (Singh and Om Prakash, 1985). Similarly, the water holding capacity of these eroded soils are much less (30.2 %) compared to that of a productive red soil (39.6 %). It is well documented that the soil moisture retention capacity is influenced by the amount of soil organic matter, porosity and bulk density (Biswas and Ali, 1969).
Summary of Chapters
I. INTRODUCTION: Outlines the dual challenge of resource degradation in wastelands and the accumulation of nutrient-rich organic wastes, setting the rationale for using the latter for land reclamation.
II. REVIEW OF LITERATURE: Reviews the definitions and features of wastelands, existing restoration strategies, and the viability of using municipal and agro-industrial wastes as nutrient sources.
III. MATERIAL AND METHODS: Details the site selection process in the Eastern Dry Zone of Karnataka, the collection of organic wastes, and the experimental designs for soil analysis and field trials.
IV. EXPERIMENTAL RESULTS: Presents the findings regarding the characteristics of the wastelands, the composition of the organic wastes, and their subsequent impact on plant growth and soil properties.
V. DISCUSSION: Interprets the experimental data, highlighting how organic waste application improves soil conditions and promotes afforestation while considering the risks of heavy metal contamination.
VI. SUMMARY: Concludes by synthesizing the study's findings, confirming that organic waste recycling is a viable and environmentally sound strategy for wasteland reclamation.
Keywords
Wasteland reclamation, organic wastes, soil fertility, afforestation, soil physical properties, nutrient management, heavy metals, distillery sludge, municipal sludge, pressmud, tree growth, soil organic carbon, Eastern Dry Zone, Karnataka, sustainable development.
Frequently Asked Questions
What is the primary objective of this research?
The primary objective is to evaluate the influence of applying nutrient-rich organic wastes (such as distillery, municipal, and industrial sludge) on wasteland reclamation and the subsequent growth performance of various tree species.
What types of organic wastes were analyzed?
The research analyzed organic wastes from sugar mills, paper mills, distillery plants, municipal sewage treatment plants, and Farm Yard Manure (FYM) as a control.
How were the wastelands characterized?
The wastelands were characterized by analyzing their physical and chemical features, specifically focusing on soil texture, bulk density, water holding capacity, and nutrient content compared to normal agricultural soils.
Which tree species were used for the field experiment?
The experiment utilized Pterocarpus marsupium, Melia dubia, Azadirachta indica, Pongamia pinnata, Tectona grandis, and Holoptelea integrifolia.
What were the main findings regarding soil health?
Application of organic wastes significantly improved soil organic carbon levels, water holding capacity, and the availability of macro- and secondary nutrients in the previously degraded wastelands.
Are there environmental risks associated with this method?
Yes, the study identifies a potential risk of heavy metal contamination (such as Pb, Cr, Ni, and Cd) depending on the type of waste applied; however, it notes that the levels observed remained within manageable limits during the study period.
What effect did the application of distillery sludge have on the soil?
Distillery sludge significantly increased the availability of potassium, calcium, and sulfur in the soil, contributing to improved plant growth metrics.
How does the research address the issue of coarse fragments in wasteland soil?
The study accounts for the "dilution effect" of gravel (coarse fragments), which do not contribute nutrients or moisture retention, by calculating nutrient and water availability specifically for the fine earth fraction of the soil.
- Citation du texte
- Prabhakara Reddy (Auteur), 2014, Influence of Nutrient Rich Organic Wastes in Wastelands Reclamation, Munich, GRIN Verlag, https://www.grin.com/document/268299
