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A field experiment was conducted at University of Agricultural Sciences, GKVK, Bengaluru during kharif 2022 to studies on influence of lipo-chito oligosaccharides, nano and water-soluble fertilizer on growth and growth parameters of soybean [Glycine max (L.) Merrill]. The experiment was laid out in randomized complete block design with ten treatments and replicated thrice. The results revealed that application of 75% recommended dose of NP + 100 % K along with soil application of lipo-chito oligosaccharide (LCO) fortified bio-fertilizer @ 10 kg ha-1 + foliar application of 19:19:19 @ 2 % spray at flowering and pod filling stages recorded significantly higher leaf area, leaf area index at 60 DAS (1772 cm2 plant-1 and 4.91 respectively), leaf area duration (57.59 and 81.07 cm2 day-1 at 30-60 DAS and 60 DAS-harvest, respectively), no. of nodules plant at 35 DAS (31.12), total dry matter accumulation (12.74 and 20.05 g plant-1 at 60 DAS and harvest, respectively), absolute growth rate (0.24 and 0.30 g day-1 at 30-60 DAS and 60 DAS-harvest, respectively), crop growth rate (8.15 and 9.21 g cm-2 day-1 at 30-60 DAS and 60 DAS-harvest, respectively) and relative growth rate (0.031 and 0.040 g g day-1 at 30-60 DAS and 60 DAS-at harvest, respectively).
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The current study, "Impact of nano-DAP on growth and development of cabbage," was carried out in 2021–2022 at the Department of Horticulture's Experimental Farm at A.A.U., Jorhat. RBD was used to set up the study. The treatments followed were T1 (Untreated control), T2 (100% RDF of N & K), T3 (100% RDF of 130:80:80 kg/ha), T4 (T2 + ST with nano-DAP @ 5 ml/ltr), T5 (T2 + ST@ 10 ml/ltr), T6 (T2 + 1 FS of nano-DAP @ 6 ml/ltr at 25-30 DAT), T7 (50 % P, 100% N & K + FS nano-DAP @ 2 ml/ltr at 25-30 DAT), T8 (25% P, 100% N & K + FS nano-DAP @ 4 ml/ltr), T9 (T2 + ST @ 5 ml/ ltr + FS nano-DAP @ 6 ml/ltr), T10 (25% P, 100% N & K + ST @ 5 ml/ ltr + FS nano-DAP @ 4 ml/ltr), T11 (50% P, 100% N & K + ST @ 5 ml/ ltr + FS nano-DAP @ 2 ml/ltr), T12 (25% P, 50% N & 100% K + ST @ 5 ml/ ltr + FS nano-DAP @ 4 ml/ltr) and T13 (50% P, 50% N & 100% K + ST @ 5 ml/ ltr + FS nano-DAP @ 2 ml/ltr).Investigation was done comparing the results of the nano-DAP treatments with the suggested fertilizer dosage. The results revealed that the maximum plant spread and number of non-wrapper leaves was observed in T3 (17.12 cm) and (7.67) at 30 DAT whereas in T3 (34.77 cm) and (16.83) at 60 DAT.The highest leaf area was recorded in T3 (107.56 sqcm) at 30 DAT and at 60 DAT (226.54 sqcm), although at 30 DAT, the maximum leaf fresh weight was recorded in T7 (4.40 g) although in T3 (12.46 g) at 60 DAT. The maximum number of days (88.30 days) to harvest was taken by T5. Thus, the investigation suggests that nano-DAP can reduce the amount of inorganic fertiliser applied while maintaining the potency of the crop.
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Aim: To assess the growth and yield of grain cowpea in response to varied doses of phosphorus (P) and potassium (K) supplemented with foliar application of nano diammonium phosphate (DAP) and potassium salt of active phosphorus (PSAP).Study Design: The field experiment was a factorial experiment, laid out in randomised block design with two levels of P, three levels of K and two sources of foliar nutrition, compared against a control, with three replications.Place and Duration of Study: The study was conducted at the Integrated Farming System Research Station, Karamana, Nedumcaud, Thiruvananthapuram, Kerala, India, during the period from December 2022 to February 2023.Methods: The study utilized PGCP-6 cowpea variety and adopted fertilizer recommendations as per KAU POP (Package of Practices Recommendations of the Kerala Agricultural University). The entire dose of FYM, P and K and half dose of nitrogen (N) were applied as basal dose. The remaining half dose of N was applied at 15 days after sowing (DAS). Additionally, foliar application of nano DAP and PSAP (each @ 0.4 %) was done at 20 DAS and 40 DAS.Results: The results of the study revealed that the treatment combination, p2k1f2 and p2k1f1 had comparable leaf area per plant and leaf area index (LAI) (at 60 DAS). The highest seed yield (1642 kg ha-1) was recorded with p2k1f2. Higher dose of P and K along with foliar application of nano DAP (0.4 % at 20 DAS and 40 DAS) had significant effect on the total DMP and haulm yield.Conclusion: Combined application full dose of N, half dose of P, full dose of K and foliar application of PSAP (0.4 %) at 20 DAS and 40 DAS could be recommended as the best treatment combination for yield enhancement in grain cowpea.
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Aims: Foliar nutrition is aimed to eliminate the problems of fixation and immobilization of nutrients. Hence, foliar nutrition is being recognized as a significant way of fertilizing modern agriculture, especially under rainfed conditions. Nano fertilizers because of smaller size and higher surface area are efficient as compared to conventional and produce better results when used in combined form.Study Design: The experiment was laid out in Randomized complete block design with three replications.Place and Duration of Study: A field experiment was conducted in medium black soils at Agricultural Research Station, Hagari, during Kharif 2022.Methodology: There were ten treatment combinations, consisting of different doses of RDF (50 % RNP, 75 % RNP and 100 % RDF and absolute control) with different doses of nano urea and Dap sprayed at 30 and 45 DAS for CSH-16 hybrid of sorghum.Results: Application of 75% RNP as basal + nano urea & DAP spray @ 1.5 ml l-1 each at 30 and 45 DAS recorded significantly higher number of leaves, leaf area and leaf area index. It also produced higher earhead length (35.9 cm), number of grains earhead-1 (2207), grain weight (57 g plant-1) and test weight (29.3 g 1000 grains-1). Nutrient content and uptake also showed higher values for the same treatment along with the nutrient use efficiency indices. Whereas, significant reduction in soil microbes was noticed by the application of treatment.Conclusion: Combined application of conventional and nano fertilizers helped to increase growth, growth attributes like number of leaves, leaf area, leaf area index, yield attributes, nutrient content, nutrient uptake and nutrient use efficiency of sorghum.