~ 292 ~ International Journal of Chemical Studies 2019; 7(3): 292-295 P-ISSN: 2349–8528 E-ISSN: 2321–4902 IJCS 2019; 7(3): 292-295 © 2019 IJCS Received: 03-03-2019 Accepted: 06-04-2019 Rameti Jangir Department of Agronomy, Navsari Agricultural University, Navsari, Gujarat, India JD Thanki Department of Agronomy, Navsari Agricultural University, Navsari, Gujarat, India Kranti B Patil Department of Soil science and Agricultural Chemistry, Navsari Agricultural University, Navsari, Gujarat, India Sunil Kumar Department of Dairy Extension Education, ICAR- NDRI, Karnal, Haryana, India Correspondence Rameti Jangir Department of Agronomy, Navsari Agricultural University, Navsari, Gujarat, India Growth, development, physiological growth parameters and yield of grain amaranth as influenced by integrated nitrogen management under south Gujarat condition Rameti Jangir, JD Thanki, Kranti B Patil and Sunil Kumar Abstract A field experiment was conducted at College Farm of N. M. College of Agriculture, Navsari Agricultural University, Navsari during rabi seasons of 2016-17 and 2017-18. There were six treatments applied to grain amaranth. Significantly higher dry matter accumulation and straw yield were recorded under treatment T1 (100% RDN through inorganic fertilizer) and being at par with treatment T3 (75% RDN through chemical fertilizer + 25% through BC) and T2 (75% RDN through chemical fertilizer + 25% through FYM). Whereas, significantly higher grain yield was recorded under the treatment of 75% RDN through chemical fertilizer + 25% through BC (T3) and which remained at par with application of 100% RDN through inorganic fertilizer (T1) and 75% RDN through chemical fertilizer + 25% through FYM (T2) in pooled analysis. Thus, integration of organic manure and inorganic fertilizer have higher yield potential and performed better as compared to inorganic fertilizer treatment as well as the treatment which receiving organic manure only. Keywords: Grain amaranth, recommended dose of nitrogen (RDN), Leaf weight ratio (LWR), Crop growth rate (CGR), Net assimilation rate (NAR), Dry matter accumulation (DMA) Introduction Although, in the absence of organic manure the soil productivity declines, probably result of deficiencies of secondary nutrients and micronutrients. On the other hand, use of organic manures alone suffers from drawback of low content of nutrients and its slow release characteristics, high transportation costs and limited availability in agricultural regions have prevented their widespread use. Therefore, neither organic manures nor chemical fertilizers alone can help in achieving sustainable yield production under highly intensive farming when nutrient turn over in soil plant system is much larger. Keeping in mind these all issues related to crop production, increasingly greater emphasis is now being given to the integrated nutrient management (INM) system, which plays an important role in sustaining soil health and crop production. Organic manures such as farm yard manure (FYM) and biocompost play a direct role in supplying macro-nutrients. It is a well known fact that residual effects of organic manures enhance microbial activity in soil and increase soil biomass. Nitrogen availability to crop is one of the big limiting factors in the productivity of crop and increase in the use of nitrogen fertilizers for enhancing the agricultural production has been under consideration. For economic and environmental reasons, nitrogen fertilizers should be utilized more efficiently as much as possible in crop production. So, considering the nitrogen deficiency in soils, due to increase in cropping intensity and addition of high yielding crop varieties, there is a need to supplement part of nitrogen requirement of crops through organic manures. Amaranthus or pigweed belongs to the family Amaranthaceae. It is originated from Central and South America (Grubben and Von Sloten 1981) [4] . Grain amaranth commonly called as Chaulai, Batu, Bhabhri, Ganhar, Harave, Keere, Maarsu, Marsha, Pung-keerai, Rajakeera, Sawal, Sil or Ram Dana. However, in parts of Maharashtra and Gujarat, it is known as Rajgirah “King seed”. Recently, an increased interest in amaranth appeared in the 1980s, when the United States National Academy of Science performed research on the grain and described its high nutritional value and agronomic potential. At present, India is the largest exported of amaranth seeds. India has the most favourable climate for the growth of amaranth as the crop responds well to high sunlight and warm temperature.