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Effect of Chlorophyll Meter and Leaf Colour Chart Based Nitrogen Management on Grain N Uptake for Rice in Iran
Asian Journal of Chemistry,
Vol. 22 No. 1 (2010): Vol 22 Issue 1, 2010
Abstract
Over application of N in rice leads to low N recovery efficiency and
risk of NO3 pollution of ground water. The chlorophyll meter also known
as SPAD meter, is a simple, portable diagnostic tool for identifying
crop N status. We used it to test need based N management approaches
for rice (Oryza sativa L.) in two varieties on a clay loam texture in
northern Iran. The overall objective is to develop optimal N-management
for Neda and Shirudi. Two varieties were grown under eight treatments.
Eight treatments included a zero-N control, chlorophyll meter 35, 37,
40, LCC 4 and 5. SPAD readings were taken weekly on the topmost
fully expanded leaves. Grain yield, yield attributes, total N uptake and
fertilizer - N use efficiency were measured in both varieties. Both LCC
and SPAD can be used to improve N management for Neda and Shirudi,
but the optimal SPAD threshold for determining the timing of N-application
was 35 and 37 for Neda and Shirudi, respectively. LCC treatments
indicated that N-management based on LCC shade 5 helped avoid
over application of N to rice. Neda had higher grain yield than shirudi,
but the difference in maximum grain yield among SPAD and LCC treatments
was insignificant. The two varieties didn't show a clear difference
in fertilizer-N use efficiency. It is suggested that when N-management
technology such as real time N-management (SPAD and LCC) were
used, would avoid to over application of N fertilizer by rice farmers.
risk of NO3 pollution of ground water. The chlorophyll meter also known
as SPAD meter, is a simple, portable diagnostic tool for identifying
crop N status. We used it to test need based N management approaches
for rice (Oryza sativa L.) in two varieties on a clay loam texture in
northern Iran. The overall objective is to develop optimal N-management
for Neda and Shirudi. Two varieties were grown under eight treatments.
Eight treatments included a zero-N control, chlorophyll meter 35, 37,
40, LCC 4 and 5. SPAD readings were taken weekly on the topmost
fully expanded leaves. Grain yield, yield attributes, total N uptake and
fertilizer - N use efficiency were measured in both varieties. Both LCC
and SPAD can be used to improve N management for Neda and Shirudi,
but the optimal SPAD threshold for determining the timing of N-application
was 35 and 37 for Neda and Shirudi, respectively. LCC treatments
indicated that N-management based on LCC shade 5 helped avoid
over application of N to rice. Neda had higher grain yield than shirudi,
but the difference in maximum grain yield among SPAD and LCC treatments
was insignificant. The two varieties didn't show a clear difference
in fertilizer-N use efficiency. It is suggested that when N-management
technology such as real time N-management (SPAD and LCC) were
used, would avoid to over application of N fertilizer by rice farmers.
Keywords
. We Chlorophyll meter
Leaf colour chart
N management
Rice.
VALYNEJAD*, M., VASEGHI†, S., FALLAH‡, V., PAZIRA†, E., FALLAH‡, A., & MOAMENI‡, A. (2009). Effect of Chlorophyll Meter and Leaf Colour Chart Based Nitrogen Management on Grain N Uptake for Rice in Iran. Asian Journal of Chemistry, 22(1), 747–754. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/16704
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