Regionalização para o cultivo do feijão no Rio Grande do Sul com base na interação genótipo x ambiente¹.

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Control of the "Greyback" cane grub pest, Dermolepida albohirtum Waterh., by means of "Gammexane" (benzene hexachloride). (Includes map)

Following the initial successful testing of "Gammexane" against cane grubs in Queensland in 1945, experimental work was undertaken to determine the effect of seasonal and soil conditions and time and method of application on the efficacy of the treatment, the minimum effective dose, and the phytotoxicity of the material

Natural cross-pollination of cotton in central Queensland

The percentage of natural cross-pollination in cotton cv. Deltapine Smoothleaf and Empire Red Leaf in the Callide Valley was investigated over a period of 2 years

Maintenance of citrus seed viability

Seed viability could be maintained in storage for long periods provided the seed retained its initial moisture content, was kept cool and was protected with a suitable fungicide. Seed should be washed after extraction from the fruit, superficially dried, treated with Spergon and stored at a temperature within the 5-10° C. range in sealed polythene bags. Seeds of Emperor and Cleopatra mandarins retained their viability better than those of rough lemon and Joppa sweet orange, particularly when the storage period exceeded 6 months. Laboratory germination data for seed with the seed-coat unopened gave a better correlation with germination in the seed-bed than laboratory data from seed in which the seed-coat was opened before test. Most storage and seed extraction methods which maintained the viability of the seed also resulted in quick germination. However, some fungicidal treatments retarded germination

Manual of cane growing

+375hlm.;23c

Genotype × environment interactions and environmental adaptation. I. Pattern analysis - application to soya bean populations

The application of numerical classificatory and ordination procedures to the analysis of adaptation of populations, cultivars, or lines is discussed. Examples given are seed yield and seed protein percentage for a population of soya bean lines evaluated across environments in south-eastern Queensland. For each line, p attributes (mean performance in each of p environments) were defined, and were considered to represent a p-dimensional space. The performance of the lines defined their position in this space, and the attributes were used to classify the lines into groups which differed in the magnitude and/or direction of their environmental responses. Within groups, lines exhibited variations across environments which were similar in both direction and magnitude. The relative proximity of lines in the space was obtained by ordination, and this reflected the degree of similarity of their performance across environments. The actual environmental responses of a large number of lines may be examined by these methods, both individually and as members of groups of lines having similar responses. Unlike other analyses of adaptation, these methods require no prior assumption regarding the distribution and suitability of a particular environmental response. Consequently, the analysis is designed to allow hypothesis generation. If desired, a ‘suitable’ or ‘ideal’ response surface may be defined, but this occurs subsequent to, and may be independent of, the identification of the actual responses of the lines and groups of lines