<div>Excessive feldspar mining is becoming an alarming issue due to the untreated mine spoil. For the success in the remediation of mine spoil, selection of plant species is an important factor. Therefore being a nitrogen fixer, legumes can be an alternative and are needed to be broadcasted for the rehabilitation of mined lands. In this context guar (<em>Cyamopsis tetragonoloba</em> L.) can be preferred which excels in enhancing soil fertility and is already in cultivation but not experimented with feldspar due to not establishing its rhizosphere fertility. In this study to enhance the fertility status and biological activities of feldspar mine spoil plantation of guar is done with the inoculation of microbes <em>Azotobacter Azospirillum</em> and <em>Glomus mosseae</em> (AMF) and organic and inorganic amendments. This attempt has successfully enhanced the rhizosphere enzymes at the rate of 10-65% maximum with AMF+ OM+ NPK50% (T16), nutrient uptake 10-70% maximum with <em>Azotobacter</em>+ OM+ NPK 50% (T7) and plant metabolites 10-51% also observed maximum with T7 over the uninoculated control. Guar has also shown positive response towards the applied treatment and grown well. Based on the results it can be inferred that guar can tolerate detrimental effects of feldspar mining. Hence, it is concluded that guar can be a potential crop to restore soil health of feldspar mined land for sustainable development. &nbsp;</div>


<div>Guar (<em>Cyamopsis tetragonoloba</em> L.): A Potential Candidate for the Rehabilitation of Feldspar Mine Spoil Amended with Bioinoculants</div>


<div>In recent researches, legumes have been used to revegetate the mining areas with nitrogen-fixing species. The current study also used legumes to revive the fertility of feldspar mine spoil along with Azotobacter chrococcum, Azospirillum brasilense and Glomus mosseae (AMF) in various combinations with organic and inorganic nutrient supplements. All legumes Acacia nilotica, Acacia senegal, Prosopis cineraria, Cyamopsis tetragonoloba and Cassia angustifolia have shown significant enhancement in rhizosphere enzyme activities up to 65%, metabolites up to 51% and nutrient uptake up to 52% whereas, physical growth showed the increment in the range of 10&ndash;59% over the uninoculated control. Treatment of Azotobacter+ organic manure+ NPK 50% has been found to enhance maximum growth in most of the parameters significantly, followed by AMF+ organic manure+ NPK50% treatment, while Azospirillum showed its highest impact in enhancing enzyme activities and nitrogen uptake in comparison to Azotobacter and AMF. Legume tree and crop species showed significant response towards the nitrogen fixation thus helped in improving the nutritional value of the mine spoil. Hence, the integrated approach of agro-silviculture practices using legumes and bioinoculants can play a key role in the rehabilitation of feldspar mine spoil.</div>


<div style="text-align:justify">Feldspar Mine Spoil Rehabilitation: Use of Legumes and Bio Inoculants to Establish Soil Fertility on Agro&ndash;Silviculture Basis</div>


<div style="text-align: justify;">Five pedons (P) were evaluated for their suitability to maize as alternate crop for the existing dominant rice crop at water scarce condition by variation in physiography, parent materials, and soil nutrients in Ponnaniyar basin. The pedons had the parent materials of non-calcareous gneiss with feldspar (P1), granite and feldspar intermingled (P2), weathered gneiss (P3), weathered quartz and felspatic gneiss (P4) and gneiss with lime (P5) with soil orders of Vertisol (P3, P5), Inceptisol (P1, P2) and Alfisol (P4). The soils were low, medium and high in available N, P and K status respectively. Based on the soil analytical report suitability of maize was established. Kunnatur, Eliyattur and Tiruchengodu series are moderately suitable (S2) for maize cultivation. Whereas, Manapparai and Pilamedu series are highly suitable (S1) for maize cultivation. Also, based on the soil fertility data, the map was generated using-the software Arc GIS 10.1 with the help of GPS information for future reference.</div>

Guar (Cyamopsis tetragonoloba L.): A Potential Candidate for the Rehabilitation of Feldspar Mine Spoil Amended with Bioinoculants

Feldspar Mine Spoil Rehabilitation: Use of Legumes and Bio Inoculants to Establish Soil Fertility on Agro–Silviculture Basis

Evaluation of soil site for suitability of maize and fertility mapping using gis 10.1 in ponnaniyar basin, Trichy, Tamil Nadu, India