Heritability of four quantitative characters in two crosses of Brassica campestris L. was found to be high. Dominance was detected only for plant height at heading time in both the crosses, and for sowing-to-heading period in Toria-TP × Toria-7. Transgressive segregation was expected in the segregating progenies for all the characters. Epistasis was complementary in all characters except in plant height at ripening time, where it was of the duplicate type. Additive × dominance type of epistasis was most significant and was present in most of the characters. Genes for most of the characters were linked with a major gene for seed colour (Rr). Yield was genetically correlated with the four quantitative characters studied.

The literature for the past seventy years describes a variety of methods of sampling tea leaves, in some of which analytical data from samples have been suggested as capable of widespread use as a measure of the nutritional status of tea plantations.

Cross-inoculation tests among ten Acacia species and cowpea (Vigna sinensis) showed that eight Acacia spp were related to cowpea while two were independent and this agreed with the placement of Acacia in the cowpea group. The Acacia rhizobia showed certain cultural and physiological similarities to the cowpea Rhizobium and were resistant to high temperatures.

The results are presented of an investigation into the use of very small plots for experimental work on maize (Zea mays) and groundnut (Arachis hypogaea), for the first three harvests of a project which is continuing. Despite the diminutive plot size, the random variation was quite low, resulting in a fairly sensitive experiment. The yield responses to increasing plant density were pronounced for both maize and groundnut, giving optimal spacings of 30 × 6 in. and 12 × 4 in. respectively.