Title:	Broken-stick model to determine the final period of possible companioship between weeds and soybean.
Authors:	SPADOTTO, C. A. LUIZ, A. J. B.
Affiliation:	CLAUDIO APARECIDO SPADOTTO, CNPDA; ALFREDO JOSE BARRETO LUIZ, CPAC.
Date Issued:	1991
Citation:	In: INTERNATIONAL PLANT PROTECTION CONGRESS, 12., 1991, Rio de Janeiro. Oral and poster sessions - program and abstracts. Rio de Janeiro: [s.n.], 1991.
Pages:	n.p
Description:	Productivity data got in two experiments were used with the objetive of evaluating statistical methods to determine the final period of possible companionship between weeds and soybean. The field experiments were delineated using the randomized block design. The crop was kept weed-free for increasing initial periods. Throught Duncan's Test and Tukey's Test (p=0,05), the final period began in 20 days, to both experiments. However, in quantitative series of treatment, the utilization of regression is very much useful and statistically indicated. Using the broken-stick regression model, the final period began in 21 days in exp. 01[Y-1962.04:1901 (X-21|X-21|); R2=0.70***], and 41 days in exp.02 \{Y=2397.45+11.84 (X-41|X-41|); R2=0.72***\}. Therefore, broken-stickmodel is able to supply important informations to weed management.
NAL Thesaurus:	statistics weeds
Keywords:	Soya Soybean Association Model
Type of Material:	Resumo em anais e proceedings
Access:	openAccess
Appears in Collections:	Resumo em anais de congresso (CNPMA)