National Initiative on Climate Resilient Agriculture Nitrogen use - PowerPoint PPT Presentation

National Initiative on Climate Resilient Agriculture Nitrogen use efficiency (NUE) in Rice N. Sailaja, SRF Co PI Dr. K. Surekha and Dr. MBB Prasad Babu Soil Science Directorate of Rice Research, Rajendranagar, Hyderabad

 To analyze soil samples at different growth stages for soil properties  To analyze per cent N in grain and straw samples.  To analyze percent N in Hydroponics samples

Soil properties of NICRA plot after Kharif 2013 harvest (mean of 5 replications) Soil Property N0 N50 N100 pH 7.34 7.44 7.64 EC (ds/m) 0.32 0.25 0.34 Available N (kg/ha) 220 234 231 Available P 2 O 5 (kg/ha) 40 45 56 Available K 2 O (kg/ha) 743 798 704 O.C (%) 0.68 0.59 0.75 KCl N (mg N/ kg soil) 3.15 3.25 3.51 Urease (µg NH4/g soil/ 2h) 57 64 73 * No significant difference between N0 N50 and N100 levels

KCl N in the wet soil sample during crop growth period, Kharif 12-13 KCl N (mg/Kg soil) during Kharif 2013 (Mean of 5 replications) 15 DAT 30 DAT 50 DAT at maturity after harvest N0 3.05 3.21 3.65 4.02 3.15 N100 3.61 3.62 5.15 4.75 3.51 * Highest nitrogen was recorded in N100 levels.

Urease enzyme activity in soil, kharif 2013 180 160 140 µg NH4 N/g soil/2h 120 100 N100 80 N0 60 40 20 0 15DAT 30DAT 50DAT at after maturity harvest * Highest urease activity was observed at 50 DAT during crop growth period

Nitrogen content (%) in Hydroponics %N in Hydroponic samples N0 N100 S.no Variety Range mean Range mean 1 Heat tolerant lines 1.00-1.8 1.69 1.16-3.2 2.67 2 IRHTN2009-2010 0.84-1.95 1.68 2.07-3.03 2.47 3 Germplasm lines 0.65-2.2 1.6 1.97-3.10 2.47 4 Upland rice varieties 1.25-2.6 1.68 1.43-2.84 2.33 5 Aerobic rice varieties 1.46-1.78 1.7 2.17-2.96 2.62 6 R.V population (Rasi × Vibhava) 1.33-2.12 1.74 2.17-3.54 3.05 * % N in N0 ranged from 0.65 – 2.6 % whereas in N 100 it ranged from 1.16 - 3.54 %

Per cent nitrogen in Early duration varieties of Hydroponics %N S.no Variety N0 N100 1 Rasi 1.72 3.72 2 Anjali 1.56 3.04 3 Annada 1.35 3.23 4 Prasanna 1.45 3.42 5 MTU-10 1.52 2.6 6 Aditya 1.69 3.02 7 Tulasi 1.71 3.17 8 Tellahamsa 1.68 3.04 Mean 1.59 3.16 * Rasi has highest % N in both N0 (1.72 %) and in N100 (3.72 %)

Per cent N in medium duration varieties of Hydroponics S.no Variety N0 N100 1 Varadhan 1.62 2.99 2 Jaya 1.62 2.74 3 Sampada 1.47 3.54 4 PA-6444 1.52 2.88 5 Pusabasmati 1.63 2.86 6 Vasumati 1.7 3.29 7 DRR H2 1.65 3 8 Krishnahamsa 1.59 2.69 9 IR-64 1.42 1.18 10 KRH2 1.42 2.77 11 DRRH3 1.59 2.76 12 RP bio 4918-248 1.05 1.58 13 Rpbio 4919-458 1.04 1.54 14 Rpbio 4919-377-13 1.03 1.27 15 Akshyadhan 1.5 1.76 Mean 1.46 2.46 * Vasumati recorded high % N in N0 (1.7) Sampada has more % N in N100 (3.5 %)

Per cent N in Late duration Varieties of Hydroponics % N S.no Variety N0 N100 1 Swarna 1.67 3.44 2 BPT5204 1.56 3.08 3 Mahsuri 1.53 2.95 4 RP bio 226 1.58 3.06 5 Sugandhamati 1.52 2.82 Mean 1.57 3.07 * Swarna exhibits high % N in both N0 (1.67) and in N100 (3.44)

Percent Nitrogen in Early, Medium and late duration varieties(Mean Values) 3.16 3.07 3.5 2.46 3 2.5 1.59 1.57 1.46 2 1.5 1 0.5 0 early medium late N0 N100

Grain yield (t/ha) of genotypes at two N levels Kharif 2012 Rabi 2012-13 Varieties N0 N 100 Yield diff. N0 N 100 Yield diff. (t/ha) (t/ha) V1-Rasi 3.18 6.05 2.87 3.89 5.37 1.48 V2-Vandana 3.28 4.75 1.47 3.39 4.70 1.31 V3-Suraksha 3.80 4.94 1.14 3.43 4.29 0.86 V4-IET 21665 3.18 4.30 1.12 3.59 4.44 0.85 V5-DRR Dhan 39 3.16 4.84 1.68 3.80 4.69 0.89 V6-RP-5212-41-4-3-1-1-1B 4.06 5.01 0.95 3.57 4.65 1.08 V7-Vikas 3.16 6.26 3.10 4.24 4.97 0.73 V8- Improved chittimutyalu 2.63 4.46 1.83 2.45 3.50 1.05 V9-Dhanrasi 3.81 5.96 2.15 4.47 5.68 1.21 V10-DRRH 79 3.67 5.43 1.76 3.35 4.67 1.32 V11-DRRH 82 4.76 7.54 2.78 3.70 5.08 1.38 V12-NDR 359 3.50 4.75 1.25 4.50 5.17 0.67 V13-Swarna 3.72 5.16 1.44 4.63 5.46 0.83 V14-Mandya vijaya 4.06 6.02 1.96 3.75 4.99 1.24 V15-IET 21044 2.59 3.93 1.34 3.89 4.35 0.46 Mean 3.50 5.30 3.78 4.80 CD (0.05) – Main-0.221, sub-0.721, CD (0.05) – Main-0.36, sub-0.57, M in S – 0.79, S in M – 0.80 M X S - NS

Grouping of genotypes based on the grain yield data S. No Group Genotypes Kharif 2012 Rabi 2012-13 1 Good yielders at N0 but less responsive at Suraksha, RP-5212-41-4-3-1-1-1B, IET21665, DRRdhan 39, RP- N100 (yield difference is <2.0 t/ha between N0 DRRH 79, Swarna, NDR 359 5212-41-4-3-1-1-1B, Vikas, and N100) Dhanrasi, NDR 359, swarna, Mandyavijaya, IET 21044 2 Good yielders at N0 as well as N 100 (recorded DRRH 82, Dhanrasi, Mandyavijaya Rasi, DRRH 82 maximum yield at N0 as well as N100) 3 Not good yielders at N0 but responded to N 100 Rasi and Vikas - ( the yield difference is > 2.0 t/ha) 4 Medium yield levels both at N0 and N100 Vandana, IET21665, DRRdhan 39, Vandana, Suraksha, DRRH Improved chittimutyalu 79 5 Not a high yielder both at N0 and N100 - Improved chittimutyalu