共 14 条
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- [2] Using a chlorophyll me-ter to predict nitrogen fertilizer needs of winter wheat. Fox R H,Piekielek W P,Macneal K M. Com-mun Soil Sci Plant Anal . 1994
- [3] Field chlorophyll measu-rements to assess the nitrogen status of potato varieties. Minotti P L,Halseth D E,Sieczka J B. HortScience . 1994
- [4] Method for using im-ages from a color digital camera to estimate flower number. Adamsen F J,Coffelt T A,Nelson M,et al. Crop Science . 2000
- [5] Estimating cornleaf chlorophyll concentration from leaf and canopy reflectance. Daughtry C S T,Walthall C T,Kim M S,et al. Remote Sensing of Environment . 2000
- [6] Measuringwheat senescence with a digital camera. Adamsen F J,Pinter Paul J Jr,Barnes E M,et al. Crop Science . 1999
- [7] Direct measurement ofpetiole sap nitrate in potato to determine crop nitrogen status. Westcott M P,Rosen C J,Inskeep W P. Journal of Plant Nutrition . 1993
- [8] Correlations between soil nitrate con-centrations in late spring and corn yields in Iowa. Blackmer A M,Webb J. JournalProduction Agriculture . 1989
- [9] Estimating vegetation coverage inwheat using digital images. Lukina E,,Stone M,Raun W. Journal of Plant Nutrition . 1999
- [10] Use of a chlorophyll meter tomonitor nitrogen status and schedule fertigation for corn. Blackmer T M,Schepers J S. JProd Agric . 1994