Vol. 8, Special Issue 7, Part K (2024)

A field study entitled “Effect of organic sources on soil properties and assessment of yield and nutrient uptake by late sown wheat (Triticum aestivum L) Cv. PBW 502” was conducted during rabi 2022-23 at research farm of soil science and agricultural chemistry, NAI, SHUATS, Prayagraj, Uttar Pradesh. The soil of the experimental site was Inceptisol which was sandy loam in texture, low available nitrogen, potassium and medium phosphorus in soil.

The experiment had 10 treatments replicated 03 times in randomized block design. The 10 treatments comprised of control, soil application of 100% RDF (120:60:40 NPK kg ha-1) and different combination of vermicompost, humic acid, fulvic acid, sea weed extract, potassium humate and foliar sprays of vermicompost extracts, Cow urine, GA3 and moringa, Lantana camara or pomegranate leaf extracts.

The results indicated that, among all the organic treatments application of vermicompost 2.5 t ha-1 + Fulvic acid 10% + Humic acid 20% + sea weed extract 5% + spraying of vermicompost extract 5% at 30-35 and 60-65 DAS (T10) and vermicompost 2.5 t ha-1 + Potassium humate 80% + spraying of vermicompost extract 5% at 30-35 and 60-65 DAS (T9) recorded the most favorable results in terms of minimum bulk density (1.20 & 1.21 Mg m-3), particle density (2.13 & Mg m-3), maximum pore space (48.16 & 47.13%), water retaining capacity (45.87 & 45.46%), pH (7.00 & 6.92), EC (0.21 dSm-1), organic carbon (0.47 & 0.46%), available nutrients (Nitrogen 252.3 & 249.3 kg ha-1), (Phosphorus 16.70 & 16.41 kg ha^-1), (Potassium 155.01 & 154.31 kg ha^-1), Nitrogen content (2.13 & 2.02% in grain), (0.82 & 0.80% in straw), Phosphorus content (0.45 & 0.47% in grain), (0.23 & 0.22% in straw), Potassium content (0.32 & 0.31% in grain), (1.45 & 1.44% in straw), Nitrogen uptake (78.12 & 71.26 kg ha^-1 in grain), (39.40 & 36.85 kg ha-1 in straw), Phosphorus uptake (15.50 & 15.58 kg ha-1 in grain), (10.37 & 10.57 kg ha-1 in straw), Potassium uptake (11.68 & 10.93 kg ha^-1 in grain), (69.67 & 66.34 kg ha^-1 in straw), Carbohydrate content (58.11& 56.55%), Protein content (13.31 & 12.62%), Plant height (76.82 & 77.57 cm), Number of effective tillers/m2 (276 & 275), Spike length (10.70 & 11.78 cm), Number of grains per spike (52), Wheat yield (36.65 & 35.28 q ha-1 in grain), (48.05 & 46.07 q ha^-1 in straw), (84.70 & 81.35 q ha-1 in biological yield). Additionally, T₁₀ had the highest benefit cost ratio of 1.42.