The appropriate application of manures and fertilizers as a nitrogen source can greatly impact the nutrient content and absorption by plants, which in turn affects crop yield. Rice is an exhaustive crop which removes a large amount of nutrients from the soil. So, to study the soil fertility status it is important to study nutrient removal from the soil. Keeping this in mind, a field experiment was conducted at Chaudhary Charan Singh Haryana Agricultural University, Krishi Vigyan Kendra farm, Fatehabad (Haryana) during Kharif 2020 to study the effect of different nitrogen sources on N, P, K, and S content and their uptake by rice grain and straw. The experiment was laid out with fourteen treatments, viz., T1 (Control), T2 (100% RDN through urea), T3 (75% RDN + 25% N through FYM), T4 (50% RDN + 50% N through FYM), T5 (25% RDN + 75% N through FYM), T6 (100% N through FYM), T7 (75% RDN + 25% N through Vermicompost), T8 (50% RDN + 50% N through Vermicompost), T9 (25% RDN + 75% N through Vermicompost), T10 (100% N through Vermicompost), T11 (75% RDN + 25% N through Poultry manure), T12 (50% RDN + 50% N through Poultry manure), T13 (25% RDN + 75% N through Poultry manure), and T14 (100% N through Poultry manure). In grain and straw, the N content varied from 1.17 to 1.30 % and 0.43 to 0.57 %, respectively. The treatments T2, T3, T7 and T11 recorded the highest N content in grain (0.51 %) and straw (0.26 %). In grain, the highest P content (0.51 %) was observed in T2, T3, T7 and T11 and the lowest (0.38 %) in T1 treatment. Phosphorus content in straw varied from (0.26 %) in T2, T3, T7 and T11 to (0.19 %) in T1 treatment. In grain, the highest K content (0.52 %) was observed in T2, T3, T7 and T11 and the lowest (0.39 %) was observed in T1. In straw, K content ranged from 1.56 % in T1 to 1.80 % in T2, T3, T7 and T11 treatment. In grain and straw, the highest (0.20 %) S content was observed in treatment T2, T3, T7 and T11. Apart from this, treatment T2 also recorded the highest uptake of N, P, K, and S in grain and straw. So, this study helped in understanding the amount of nutrients removed from the soil by rice crop.

Nitrogen sources, RDN, FYM, Vermicompost, poultry manure, nutrient content, uptake

The results of the study indicate that the type of nitrogenous source used had a significant impact on the nutrient content of rice grain and straw. The nutrient content was higher in treatments where chemical fertilizers were used, indicating that these fertilizers provide plant nutrients in a readily available form for plants. In contrast, treatments using organic sources had lower nutrient content, suggesting that these sources may not be fully decomposed and therefore not as easily available to the plants. The nutrient content in grain and straw is also influenced by the overall nutrient status of the soil.

Amit Kumar, S.K. Singh, Rohtas Kumar, Sandip Kumar Gautam and Mohit Sharma (2022). Investigating the Impact of Nitrogen Sources on Nutrient Content and their Uptake in Rice Grain and Straw. Biological Forum – An International Journal, 14(4a): 455-461.