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Subject: Agronomy × Author: Singh, Sushil Kumar × End date: 2004 × Start date: 2004 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Studies on nitrogen management in summer rice (Oryza sativa L.) under different crop establishment methods
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2004-08) Singh, Sushil Kumar; Singh, Satya Pal
    A field experiment was conducted during spring season, 2003 at Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar , Uttaranchal. The experiment was laid-out in split plot design, keeping crop establishment methods (Transplanted on flat beds, transplanted on raised bed method) in main plots and nitrogen management practices i.e. control, recommended nitrogen, farmer‟s fertilizer practices, SPAD 35-37, SPAD 37-39, LCC 3.5, LCC 4.0, LCC 4.5 in sub plots with three replication. The transplanting crop on raised beds gave higher grain (70.0 q ha-1) and straw (98.9 q ha-1) yields than transplanted on flat beds. The nitrogen management practices based on LCC 4.0 shade i.e. 180 kg N ha-1 recorded significantly higher grain yield (84.9 q ha-1) followed by LCC 4.5 (77.5 q ha-1) and SPAD 37-39 (74.0 q ha-1) which were 28.44, 17.24 and 11.95 per cent higher, respectively over recommended dose of 150 kg N ha-1 and 31.84, 24.0 and 18.40 per cent higher over 120 kg N ha-1 as farmer‟s practice. The straw yield was found maximum in case of LCC 4.5 (111.9 q ha-1) where total 210 kg N ha-1 was applied followed by SPAD 37-39 (107.6 q ha-1) and LCC 3.5 (106.2 q ha-1). Crop establishment methods influenced number of grains panicle-1 significantly. The number of grains panicle-1 were higher in transplanted crop on raised beds than crop transplanted on flat beds. The number of spikelets and grains panicle-1 were maximum in SPAD 37-39 based nitrogen management practice whereas number of panicle m-2 recorded higher in LCC 4.5 nitrogen management practice. Total nitrogen uptake and nitrogen use efficiency were also recorded higher under raised bed method of crop transplanting while among the nitrogen management practices the total nitrogen uptake was found higher in LCC 4.5 practice followed by LCC 4.0 practice and nitrogen use efficiency was higher under SPAD 37-39 and LCC 4.0, where total 150-180 N ha-1 was applied, respectively. Thus, transplanting of summer rice crop on raised beds fertilized with 150 to 180 kg N ha-1 and splitting based on LCC 4.0 or SPAD 37-39 reading with 30 kg N ha-1 as basal dose had significant beneficial effect on yield and yield attributes of rice with better nitrogen use efficiency.