NONLINEAR REGRESSIONS FOR ANALYZING GROWTH STAGE AND QUINCLORAC INTERACTIONS

被引：42
|
作者：
CHISM, WJ
BIRCH, JB
BINGHAM, SW
机构：
来源：
WEED TECHNOLOGY | 1992年 / 6卷 / 04期
关键词：
CRABGRASS CONTROL; PHYSIOLOGICAL FACTORS; HERBICIDE; BAS-514-H; BAS-090-S;
D O I：
10.1017/S0890037X00036447
中图分类号：
S3 [农学（农艺学）];
学科分类号：
0901 ;
摘要：
Control of southern crabgrass by quinclorac was influenced by plant growth stage. A three-parameter nonlinear regression was used to describe the influence of quinclorac concentration on each growth stage and to compare growth stages. A SAS(R) program for these comparisons is described. Pseudo R2 values for fit were above 0.98 for all tests. Flowering crabgrass plants had the highest GR50 value (50% growth reduction on a dry weight basis) whereas preemergence, three- to five-true-leaf, and two- to four-tiller stages were lower.
引用
收藏
页码：898 / 903
页数：6
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