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ThesisItem Restricted Response of seed potato (Solanum tuberosum L.) to phosphorus management and growth regulators(Punjab Agricultural University, 2023) Amanpreet Singh; Aulakh, C.S.The present study entitled “Response of seed potato (Solanum tuberosum L.) to phosphorus management and growth regulators” was conducted during 2019-20 and 2020-21 at Research Farm, School of Organic Farming, PAU, Ludhiana and Farmer’s Field, Jalandhar. The soils of the experimental field at Ludhiana and Jalandhar were loamy sand and sandy loam with high and medium levels of available phosphorus, respectively. The experiments on phosphorus management were conducted at Research Farm, School of Organic Farming, PAU, Ludhiana and Farmer’s field, Jalandhar in split plot design with three replications and three main plot treatments [organic sources- Control, Biofertilizer (Biof) and Farmyard manure (FYM)] and five subplot treatments [Fertilizer P – 0%, 75%, 100%, 150% and 200% of recommended dose (62.5 kg P2O5 ha-1)]. The application of FYM at 50 t ha-1 recorded significantly higher growth and yield attributes, productivity, seed size (35-45mm) tuber yield and economic returns during both the years at Ludhiana and Jalandhar. At Ludhiana, FYM application resulted in 35.8 and 34.4 percent increase in seed-size tuber yield (95.9 and 113.6 q ha-1) as compared to unfertilized control during 2019-20 and 2020-21, respectively. Tuber quality attributes (except TSS and non-reducing sugars) were also significantly higher with the application of FYM as compared to biof and control. The application of FYM had significant positive influence on soil organic carbon (SOC) and available P. The significantly lower disease incidence and aphid population were observed with FYM. The biof also performed significantly better than the unfertilized control in terms of growth, yield and quality attributes. The significantly higher growth attributes, total tuber yield, seed size (35-45mm) tuber yield, tuber quality attributes, nutrient uptake and economic returns were observed with 125 kg P2O5 ha-1 (200% P) but were statistically at par with 93.8 kg P2O5 ha-1 (150% P) at both the locations during both the years. At, Jalandhar, higher level of fertilizer P, 125 kg P2O5 ha-1 resulted in 13.4 and 14.5 percent higher seed-size tuber yield than 93.8 kg P2O5 ha-1 during both the years. Soil pH, EC, SOC, available N and available K, were not influenced significantly by different levels of P. The significantly lower disease and aphid incidence were recorded with 125 kg P2O5 ha-1 as compared to all the other treatments except 93.8 kg P2O5 ha-1 during both the years at both the locations. The experiment to study the effect of plant growth regulators on growth, productivity and quality of seed potato was conducted at Ludhiana in randomized complete block design with three replications and 11 treatments i.e., Control, IBA (100 ppm), IBA (200 ppm), NAA (25 ppm), NAA (50 ppm), Ethrel (25 ppm), Ethrel (50 ppm), GA3 (100 ppm), GA3 (200 ppm), jeevamrit and wastedecomposer. The increase in seed-size tuber yield with GA3 (200 ppm) as compared to the control was 51.8 and 39.0 percent during 2019-20 and 2020-21, respectively. Significantly higher yield attributing characters and seed size (35-45 mm) and total tuber yields were obtained with foliar application of GA3 (200 ppm) at 45 and 60 days after sowing during both the years. It improved tuber quality (except TSS, ascorbic acid and non-reducing sugars) and gave the highest B:C ratio. The net returns were higher for GA3 (200 ppm) [` 302.0 thousand ha-1 and 361.2 thousand ha-1 during 2019-20 and 2020-21, respectively] due to higher seed as well as total tuber yield. Significantly lower post-harvest losses than all the other treatments were observed with foliar application of GA3 (200 ppm). The significantly lower late blight incidence was observed with GA3 (200 ppm).
