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| Titel: |
Microwave-oven drying of rice leaves for rapid determination of dry weight and nitrogen concentration |
| Auteur: |
Peng, Shaobing Laza, Ma. Rebecca C. Garcia, Felipe V. Cassman, Kenneth G. |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 17 (1994) nr. 1 pagina's 209-217 |
| Jaar: |
1994-01 |
| Inhoud: |
Predicting the need for fertilizer-nitrogen (N) topdressing based on plant N status is an important N management strategy for increasing both grain yield and N-use efficiency of irrigated rice. Plant N analysis by conventional-oven drying and micro-Kjeldahl procedure generally requires several days. Accurate estimation of leaf N content per unit dry weight (Ndw) at different growth stages by the chlorophyll meter requires that meter-reading values (SPAD values) be adjusted for specific leaf weight (SLW). This study demonstrated that a microwave oven can be used for drying rice leaves for quick estimation of leaf dry weight without significantly influencing the estimation of Ndw by micro-Kjeldahl procedure. Microwave oven drying of 0.5 g (dry weight) leaf samples required only two minutes. Extended exposure duration up to six minutes did not alter the measured Kjeldahl N concentration. Specific leaf weight determined with microwave-oven drying improved the prediction of Ndw by SPAD. The chlorophyll meter with SLW adjustment can provide another tool to make rapid, in-season diagnosis of crop N status. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 17 gevonden artikelen
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