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in
| Title : |
Recovery of 15th applied and crop yields of rice and wheat with tillage and crop management practices under Rice-wheat cropping system in Parsa, Nepal |
| Material Type: |
printed text |
| Authors: |
Ram C Munankarmy, Editor ; Ganesh Sah, Author |
| Publication Date: |
2010 |
| Pagination: |
442-454 p. |
| Abstract: |
An experiment with tillage and crop establishment methods was carried out with collaboration from TAEAIFAO in Ranighat, Parsa,
Nepal from 2002/03 to 2005/06 cropping cycle for exploring the nitrogen use efficiency in rice and wheat crops under new tillage
system. Four treatments were included in the study- l.a conventional practices for rice and wheat (PTF/Clj, 2. transplanting rice in
unpuddled bed and subsequently seeding wheat with minimum till drill without distuming the bed made for rice (UPTB/D), 3.
seeding rice directly in flat field and subsequently seeding wheat with minimum till drill (UPDF/D), and 4. seeding rice in bed with
paired rows without puddling and subsequently seeding wheat with minimum till drill on bed (UPDB/D). 15 N-labe1ed urea (5
atom%) was used to supply 100 and 120 kg N/ha for rice and wheat respectively to separate micro-plots of 1.0 m x 0.8 m for flat and
1.2 m x 0.65 m for bed. Mean rice grain yields were significantly higher at PTF/CT over new practices tested. Transplanted rice gave
higher yield as compared to direct seeded rice in both bed and flat systems, but the yields between the bed and flat system within the
planting method were insignificant. Similarly, significantly higher wheat yields were found at PTF/CT over rest of the treatments.
Both rice and wheat yields were found to be decreased as the years advanced. Mean rice straw yields were insignificantly different
but wheat straw yields were significantly higher at PTF/CT over other treatments. Mean N03-N at tillering stage of rice was
significantly higher at UPDF/f' & UPDB/D than in transplanted rice in all three depths but not different at harvest. N03-N decreased
with increase in depth at both stages. In wheat, mean N03-N measured at jointing stage were found to be significantly higher at bed
than at flat within the same crop establishment method at 0-15 em depth, but similar trend was not found in other depths and at
harvest. Mean NH4-N at tillering as well as at rice harvest was not significantly different due to treatments in all three depths. Again,
the nitrogen variation with depths was not observed at both stages of rice crop. In wheat, NH4-N at jointing stage was significantly
higher at UPDB/D over other treatments at 0-15 em depth, and the level decreased with the increase in sampling depth. Significantly
higher recovery of applied 15N in rice plant was observed at PTF/CT (45.8%) over other treatments but the recovery was not
different in soil. Similarly, in wheat plant significantly higher recovery of 31.1% was observed at PTF/CT over UPDF/D but in soil
higher recovery was observed at UPTB/D over PTF/CT& UPDF/D. Mean of the treatments and the years, 38.1% of the applied 15N
was recovered in rice plant of which 23.8% in grain & 14.7% in straw, and 16.6% in soil. In wheat crop, 26.0% was recovered in
plant of which 20.7% in grain & 5.3% in straw, and 22.7% in soil. Mean N uptake by rice crop was significantly higher at PTF/CT
over UPTB/D & UPDB/D. Mean N uptake by rice was found to be 107 kg /ha, .of which 66.2 kg by grain and 40.7 kg by straw. In
wheat, N uptake was higher at PTF/CT than at UPTB/D & UPDB/D. Total N uptake by wheat was found to be 68.4 kg/ha of which
53.0 by grain and 15.4 by straw. |
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=1050 |
in
Recovery of 15th applied and crop yields of rice and wheat with tillage and crop management practices under Rice-wheat cropping system in Parsa, Nepal [printed text] / Ram C Munankarmy, Editor ; Ganesh Sah, Author . - 2010 . - 442-454 p. | Abstract: |
An experiment with tillage and crop establishment methods was carried out with collaboration from TAEAIFAO in Ranighat, Parsa,
Nepal from 2002/03 to 2005/06 cropping cycle for exploring the nitrogen use efficiency in rice and wheat crops under new tillage
system. Four treatments were included in the study- l.a conventional practices for rice and wheat (PTF/Clj, 2. transplanting rice in
unpuddled bed and subsequently seeding wheat with minimum till drill without distuming the bed made for rice (UPTB/D), 3.
seeding rice directly in flat field and subsequently seeding wheat with minimum till drill (UPDF/D), and 4. seeding rice in bed with
paired rows without puddling and subsequently seeding wheat with minimum till drill on bed (UPDB/D). 15 N-labe1ed urea (5
atom%) was used to supply 100 and 120 kg N/ha for rice and wheat respectively to separate micro-plots of 1.0 m x 0.8 m for flat and
1.2 m x 0.65 m for bed. Mean rice grain yields were significantly higher at PTF/CT over new practices tested. Transplanted rice gave
higher yield as compared to direct seeded rice in both bed and flat systems, but the yields between the bed and flat system within the
planting method were insignificant. Similarly, significantly higher wheat yields were found at PTF/CT over rest of the treatments.
Both rice and wheat yields were found to be decreased as the years advanced. Mean rice straw yields were insignificantly different
but wheat straw yields were significantly higher at PTF/CT over other treatments. Mean N03-N at tillering stage of rice was
significantly higher at UPDF/f' & UPDB/D than in transplanted rice in all three depths but not different at harvest. N03-N decreased
with increase in depth at both stages. In wheat, mean N03-N measured at jointing stage were found to be significantly higher at bed
than at flat within the same crop establishment method at 0-15 em depth, but similar trend was not found in other depths and at
harvest. Mean NH4-N at tillering as well as at rice harvest was not significantly different due to treatments in all three depths. Again,
the nitrogen variation with depths was not observed at both stages of rice crop. In wheat, NH4-N at jointing stage was significantly
higher at UPDB/D over other treatments at 0-15 em depth, and the level decreased with the increase in sampling depth. Significantly
higher recovery of applied 15N in rice plant was observed at PTF/CT (45.8%) over other treatments but the recovery was not
different in soil. Similarly, in wheat plant significantly higher recovery of 31.1% was observed at PTF/CT over UPDF/D but in soil
higher recovery was observed at UPTB/D over PTF/CT& UPDF/D. Mean of the treatments and the years, 38.1% of the applied 15N
was recovered in rice plant of which 23.8% in grain & 14.7% in straw, and 16.6% in soil. In wheat crop, 26.0% was recovered in
plant of which 20.7% in grain & 5.3% in straw, and 22.7% in soil. Mean N uptake by rice crop was significantly higher at PTF/CT
over UPTB/D & UPDB/D. Mean N uptake by rice was found to be 107 kg /ha, .of which 66.2 kg by grain and 40.7 kg by straw. In
wheat, N uptake was higher at PTF/CT than at UPTB/D & UPDB/D. Total N uptake by wheat was found to be 68.4 kg/ha of which
53.0 by grain and 15.4 by straw. |
| Link for e-copy: |
http://elibrary.narc.gov.np/?r=1050 |
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