研究目的
The objective of this research study was to evaluate the effectiveness of the OptRx? active optical sensor in soybean over different growth stages and N application rates under tiled and non-tiled drainage systems for their ability to detect crop N status and estimate grain yield.
研究成果
The study results show that the OptRxTM sensor has the potential to work for soybean as well, though later in the crop growing season. Further investigation is needed to confirm the use of OptRx? sensor for variable rate in-season N applications in soybeans.
研究不足
The study results show that the OptRxTM sensor has the potential to work for soybean as well, though later in the crop growing season. Further investigation is needed to confirm the use of OptRx? sensor for variable rate in-season N applications in soybeans.
1：Experimental Design and Method Selection:
A split plot with a randomized block design was used with drainage as the main factor, and N rate and variety as the sub-plot factors in a factorial arrangement.
2：Sample Selection and Data Sources:
The research experiments were conducted at North Dakota State University’s research site NW22 during the 2013 and 2014 crop seasons.
3：List of Experimental Equipment and Materials:
Two Ag Leader OptRx? sensors mounted on a tractor were used to collect the NDRE values over the study area.
4：Experimental Procedures and Operational Workflow:
The OptRx? sensor was tested and evaluated over two years. The sensor data were collected from the middle two rows to eliminate the edge effects.
5：Data Analysis Methods:
Statistical analysis was performed for each date using the statistical software SAS to evaluate NDRE readings against different N application rates and soybean varieties.
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