棉花生育时期SPAD值准确性与样本数的关系

doi:10.3864/j.issn.0578-1752.2011.22.024

Abstract

Abstract: 【Objective】 Research of the effects of observed samples of high yield drip irrigation cotton on N nutrition diagnosed by SPAD, to provide a theoretical basis for guiding fertilization of cotton with SPAD method. 【Method】 Adopting the method of drip irrigation under mulching in field, when N fertilizer rate was at 390 kg•hm-2, 5 programs for N fertilizer application were designed in order to supervise the 60 samples’ SPAD values of 5 N fertilizer application randomly during the whole growing period of cotton. The changing relationship between sample number and standard deviation under N fertilizer application rate of high-yielding cotton was analyzed after the yield was measured, and the influence of sample number on the accuracy of SPAD value in the growing period of cotton was defined. 【Result】 Differences were observed between the coefficient of variation of SPAD value and standard deviation; the power function relations of sample number of SPAD value (y) and standard deviation (x) at the stages of bud, early blooming, fill blooming, blooming and boll-forming, full boll-forming and early wadding are as follows: y=5632.2x-4.893（R2=0.7968），y=26456x-6.0437（R2=0.8732），y=50184x-6.5227（R2=0.9782），y=174890x-7.2601（R2=0.9655），y=27410x-5.743（R2=0.9182），y=16237x-5.3756（R2=0.942）, and y=ax-b(a,b parameters) model could be used to predict the variation of SPAD value as well as sample number in every growing period. Linear dependence of SPAD value and N content of leaves is 60＞30＞5. 【Conclusion】 The sample number influences the accuracy of SPAD average value, the larger the sample number the more accurate the SPAD average value, and the pertinence between SPAD average value and N content of the leaves will be better. Sample number of SPAD value and standard deviation is a power functional relationship.

Key words: drip irrigation under mulch, high yield cotton, SPAD value, standard deviation, sample number

CHEN Bao-Yan, MA Xing-Wang, YANG Tao, YAO Qing-Qing, XUE Xiang-Rong, WANG Bin, NIU Xin-Xiang. Research on the Relationship Between the Accuracy of SPAD Value and Sample Number in Growing Period of Cotton[J].Scientia Agricultura Sinica, 2011, 44(22): 4748-4755.

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