Search Results

You are looking at 21 - 23 of 23 items for

  • Author or Editor: Timothy L. Righetti x
Clear All Modify Search

Abstract

The ratio-based Diagnosis and Recommendation Integrated System (DRIS) was used to evaluate the mineral status of ‘Royal Ann’ sweet cherry trees. Standard ratios were developed from experimental research plots and then applied to evaluate the nutritional status of a large number of trees in a commercial orchard. DRIS indices for each element were calculated from a formula, which included DRIS standard ratios, their standard deviations, and the observed ratios from the sample being calculated. Nutritional Imbalance Indices (NII) were compared as the sum of DRIS indices irrespective of sign. By selecting a sufficiency range that produced the best agreement with DRIS evaluations, independent sufficiency ranges were derived from the commercial orchard data. Trees with high NII were consistently low-yielding, and, in mulching treatments where unfavorable NIIs were improved, yields were increased. The NII was more strongly correlated with relative yield increases than any other mineral parameter. The data imply that it is possible to develop useful DRIS standards and DRIS-derived sufficiency ranges from survey data, even though conventional statistical approaches do not reveal strong relationships between mineral concentration and yield.

Open Access

It is not appropriate to compare ratio-based expressions for different cultivars or treatments if a plot of the denominator versus the numerator of a ratio-based expression has a nonzero y-intercept and the values for either the denominators or numerators differ with cultivars or treatments. Whenever nonzero y-intercepts are encountered, the value for a ratio-based expression will be dependent on both the denominator and numerator. The “ratio problem” is demonstrated with shoot N concentration in blueberries (Vaccinium corymbosum L.) and amino acid accumulation in almonds [Prunis dulcis (Mill.) D.A. Webb]. Data were collected from the first and second growth flush of blueberry shoots on plants that were at two in-row spacings and two rates of N fertilizer. Free amino acid:total amino acid ratios were measured in dormant almond trees fertilized at different rates with and without foliar N supplements. Functions describing the relationship between dry weight and total N content in blueberry tissues have positive y-intercepts for both N fertilizer application rates. Functions describing the relationship between total amino acids and free amino acids in almond trees have a negative y-intercept. Differences attributable to fertilization rate in blueberries probably were the result of differences in N uptake and N utilization, but the effects of spacing and growth flush are indirect and can be accounted for by differences in dry weight. Likewise, effects of fertilization rate and foliar N supplement in almonds are indirect and can be accounted for by differences in the total amino acids in dormant trees. With regression one can determine if the relationship between the denominator and numerator differs for the groups or treatments being studied. When an analysis of covariance is used to account for differences in the denominators of ratio-based expressions, results are consistent with the regression analysis. When a conclusion is based on statistical differences of a ratio-based expression, it is the researcher's responsibility to determine whether these effects are direct or indirect.

Free access

Net photosynthetic rates often are dependent on leaf size when expressed on a leaf-area basis (CO2 assimilation as μmol·m−2·s−1). Therefore, distinguishing between leaf-size-related and other causes of differences in net photosynthetic rate cannot be determined when data are presented on a leaf-area basis. From a theoretical perspective, CO2 assimilation expressed on a leaf-area basis (μmol·m−2·s−1) will be independent of leaf area only when total net CO2 assimilation (leaf CO2 assimilation as μmol·s−1) is linearly related to leaf area and the function describing this relationship has a nonzero y intercept. This situation was not encountered in the data sets we evaluated; therefore, ratio-based estimates of CO2 assimilation were often misleading. When CO2 assimilation data are expressed on a per-leaf-area basis (the standard procedure in the photosynthesis literature), it is difficult to determine how photosynthetic efficiency changes as leaves or plants mature and difficult to compare the efficiency of treatments or cultivars when leaf size or total plant leaf area varies.

Free access