Flock of Romnelet sheep in a pen.

The "1947 Dominion Experimental Farm Salute to Agriculture" float. The man with a world for a head is seated at a table holding a large wooden knife and fork in his hands. All types of farm produce are on the table such as butter, cheese, meat and garden produce. An elevator and large milk bottle are in the background.

Formulas are presented which permit the estimation of variance components and their ratios in randomized blocks and split-plot designs involving replicates, lines, and testers. The magnitude of these components have been estimated in 11 experiments. These estimates indicate that for a fixed number of plots the greatest gain in total combining ability can be expected from an increase in number of testers, followed in order by an increase in lines with an increase in number of replicates being least efficient.

The studies on polyembryony in Citrus reported in this paper show that there is a great variability in the degree of polyembryony among the seeds, fruits and trees of a same form or variety of Citrus. Seeds from different crops of the same plant also show considerable variation in the degree of polyembryony. In order to obtain reliable data on the degree of polyembryony in Citrus the samples for study should include a great number of seeds taken from several fruits of different trees. Since there is a yearly variation on the degree of polyembryony it was found necessary to study samples from several crops. The average number of embryos was determined by direct examination of individual seeds. Determinations based on the number of plants developed from every seed always give lower results as many embryos do not grow into seedlings.

The pea crop is classified as one of the principal field crops in New Zealand according to the New Zealand Official Yearbook (1945). Over the last five years, although there has been an increase in the total yield, the yield per acre has decreased considerably. This decrease in yield per acre is probably due to a number of causes, among which losses due to disease are known to play an important part. There are a number of diseases which affect the pea crop in New Zealand and cause fairly extensive damage. In addition to major foliage diseases there are a number of minor diseases which, given favourable environmental conditions, may cause considerable damage to pea crops. Into this latter category falls the disease which has been chosen for this particular study. The name given to this disease where it has occurred overseas is Septoria blotch, Septoria blight, Septoria leaf-blight, or just leaf-blight. The causal organism is Septoria pisi Westend.