Sarnam Singh

Bio: Sarnam Singh is an academic researcher from Indian Institute of Remote Sensing. The author has contributed to research in topics: Vegetation & Jatropha curcas. The author has an hindex of 16, co-authored 57 publications receiving 849 citations. Previous affiliations of Sarnam Singh include Central Salt and Marine Chemicals Research Institute & Nalanda.

Forest cover change detection of Western Ghats of Maharashtra using satellite remote sensing based visual interpretation technique.

Abstract: In this article, we attempt to quantify change in forest area of the Western Ghats of Maharashtra over a 20year time period (1985–87 to 2005) using visual interpretation technique at 1 : 250 K scale. The study was conducted using the Forest Survey of India vegetation maps for 1985–87, prepared using Landsat TM data and IRS LISS III imagery for 2005. The results reveal loss of dense forest at an annual rate of 0.72% and that of open forest at 0.49%. It also reports an increase in mangrove vegetation and water bodies in the study area. In addition, it also reports districtwise pattern of change in forest cover.

Elimination of gibberellin from Kappaphycus alvarezii seaweed sap foliar spray enhances corn stover production without compromising the grain yield advantage

Abstract: Sustainable intensification of agricultural productivity is a global challenge. The sap of the commercially important red seaweed, Kappaphycus alvarezii, has been of interest in this regard, and its application as foliar spray has had a profound impact on the yields of many crops. It has been shown to contain indole acetic acid, kinetin, zeatin and gibberellic acid (GA3) but no study is yet reported on the interactions among these constituents, if any. In the present study, selective solvent extraction was undertaken to obtain GA3-free and indole acetic acid-free sap compositions. Another composition was prepared by autoclaving the sap which resulted in degradation of all the above growth hormones. The sap variants, along with water spray (control) and pristine sap, were applied on Zea mays as foliar spray over three consecutive seasons in dilute form. The four sap treatments were at par with one another—and significantly superior to control treatment—in so far as grain yield and quality were concerned. Pristine sap was subsequently shown to also contain choline and glycine betaine, and these were detected in similar amounts in all the sap variants, apparently indicating their profound influence on grain yield. Another important observation was that GA3-free sap led to heightened photosynthetic activity which translated into 26 % increase in corn stover yield compared to pristine sap. This is hypothesized to be on account of prevention of negative interactions between GA3 and other hormones. The study constitutes the first report of enhancement of performance of a natural seaweed plant stimulant towards increasing plant growth through simplification of its composition.

Remote Sensing And Image Interpretation

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Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009

Abstract: Terrestrial net primary production (NPP) quantifies the amount of atmospheric carbon fixed by plants and accumulated as biomass. Previous studies have shown that climate constraints were relaxing with increasing temperature and solar radiation, allowing an upward trend in NPP from 1982 through 1999. The past decade (2000 to 2009) has been the warmest since instrumental measurements began, which could imply continued increases in NPP; however, our estimates suggest a reduction in the global NPP of 0.55 petagrams of carbon. Large-scale droughts have reduced regional NPP, and a drying trend in the Southern Hemisphere has decreased NPP in that area, counteracting the increased NPP over the Northern Hemisphere. A continued decline in NPP would not only weaken the terrestrial carbon sink, but it would also intensify future competition between food demand and proposed biofuel production.