Nanoscience coupled with nanotechnology has emerged as possible cost-cutting measure to prodigal farming and environmental clean-up operations. Nanoscale science, engineering, and technology, which is more widely known using the novel term 'nanotechnology', is an emerging multidisciplinary field that can have enormous potential impact on our society. Nanofertilizers facilitate slow and steady release of nutrients and thereby reduce the loss of nutrients and enhance the nutrient use efficiency. The full recommended rate of conventional and nanofertilizer (FRR-CF+FRR-NF) enhanced the plant height, chlorophyll content, number of reproductive tillers, panicles, and spikelets in rice. The magnitudes of increase over the FRR-CF were 3.6%, 2.72%, 9.10%, 9.10%, and 15.42%, respectively. In rice, an exposure to Zn NP (at 0, 25, 50, 75, 100 & 150 mg L -1 ) caused significant changes in root and shoot length and mass (fresh and dry mass). The ZnO nanoparticles increased the shoot dry matter and leaf area indexes by 63.8% and 69.7% respectively in mineral poor soils. The effect of TiO 2 Nano particles was significant on number of corn in plant, maize dry weight and corn yield in P0.05 in . Mean comparison showed that the highest number of corn in plant (10.10), maize dry weight (2396.35 kg ha -1 ) and corn yield (1744.13 kg ha -1 ) were achieved by flowering stage. Silver nanoparticles in 25 ppm concentration have showed significant improvement in maximum leaf area and highest grain yield while 75 ppm concentration resulted in decrease in grain yield in wheat. Maximum number of grains per spike was recorded with 25 ppm followed by 50 ppm whereas maximum 100-grain weight was obtained for 25 and 125 ppm soil applied silver nanoparticles in wheat.
Field studies were conducted at farmer’s fields in Jodalli (Kalghatgi taluk) and Pale (Hubballi taluk) villages in 2012-13 and 2013-14, respectively to investigate the effect of NPK fertilizers on uptake of nutrients by Bt cotton and soil fertility status at harvest in Alfisol. Among the different treatment combinations, the application of 150:50:75 kg N:P2O5:K2O ha-1 (N3P1K2) recorded significantly (P=0.05) higher nitrogen (132.63 kg ha-1), phosphorus (31.26 kg ha-1) and potassium (128.94 kg ha-1) uptake by cotton. The interaction effect with respect to total micronutrients (Zn, Fe, Mn and Cu) uptake remained non significant at all the growth stages. Graded levels of fertilizers failed to exert significant impact on pH and electrical conductivity, soil organic carbon and available micronutrients during both the years of experimentation. The application of 100:50:50 kgN:P2O5:K2O ha-1 (N1P1K1) recorded significantly (P=0.05) highest available nitrogen (150.39 kg ha-1), available phosphorus (37.98 kg ha-1) and available potassium (230.99 kg ha-1) compared to rest of the treatments. The lowest available nitrogen (134.92 kg ha-1), available phosphorus (31.65 kg ha-1) and available potassium (217.63 kg ha-1) were recorded in treatment receiving 150:50:75 kg N:P2O5:K2O ha-1 (N3P1K2).
Aim: To study the effect of tube well irrigation water on soil physico-chemical properties and available nutrients status of central dry zone of Karnataka, Hiriyur taluk, Chitradurga district.
Place and Duration of Study: Aimangala, Hiriyur, Dharmapura and Javagondanahally hoblis of Hiriyur taluk, Chitradurga district from January, 2019 to September, 2019.
Methodology: Ninety-six soil samples using GPS from 0 - 22.5 cm depth were collected randomly representing Aimangala, Hiriyur, Dharmapura and Javagondanahally hoblis of Hiriyur taluk, Chitradurga district. The soil samples were analyzed in the laboratory for various physico-chemical parameters (pH and EC), organic carbon and available major (N, P2O5 and K2O) and micronutrients (Fe, Zn, Mn and Cu) status.
Results and Conclusion: The results revealed that the villages studied in different hoblis were saline to sodic in soil reaction, non-saline to saline, low to high in organic matter content, low to high in available nitrogen, low to high in available phosphorus and low to high in available potassium status and sufficiency in micronutrients viz., Cu, Fe and Mn and deficient in Zn in some of the villages.
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