The performance of Mandarin (Ottawa) soybeans was tested over a 4-year period in fifteen planting patterns resulting from five row spacings \i,74,21,28 and 35 inches) and-three plant spacings (1,2, and 3.inches) within the row. Response of yield and oil percentage to spacing was considerable. The combination of narrowest row and widest pllnt spacing within the row (7 X 3) gave the high.est yield, whereas highest per cent oil was obtained from the widest row and the widest plant spacins (35 X 3)' One year of testing of l-,2-,3-,4-, and 5-irrch plant-sp-acing,s in}-inch rorvs suggested that ttre"differcnti;l respons': of oil ahd yieid mifht be reconciled to the best advantage in a 7 X 4 patte:rn,Protein showed ]ess response io sp,acing. It was highest at the closesr spacins. The onlv siEnificant differ:ence occurred berween the 1and

The construction and use of equipment to measure the force required to pull a plant vertically from the ground as an index of corn root strength is described. Results from measurements of six inbreds in 2 yr demonstrated the efficiency of the method and identified significant differences in root strength among inbreds.

Maple Presto is the earliest maturing soybean (Glycine max (L.) Merr.) cultivar licensed in Canada. It combines with earliness the attributes of high oil content in the seed, resistance to lodging and shattering, and adequate plant height.

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In the spring of each year (1972-1974) air-dry grains of two inbred lines of Z. mays (7275-13-1 and 106) were exposed for 17 h to a low level (25 kHz) of ultrasound and subsequently planted in the field together with untreated controls and grown to maturity. In the fall of each year the ears of each group were harvested and the number of broken stalks, the yield and weight of grains and grain parts and the alcohol-soluble amino acid complement of the grain parts were determined. Broken stalks and yields were unaffected, however the embryos from the treated groups retained more moisture than their respective controls, dry weights were also significantly increased. The alcohol-soluble amino acid composition of the embryos was markedly changed, levels of proline were severely depressed in the embryos of both lines and generally increased in the endosperms. Sonication resulted in an overall decrease of up to 40% in totalled alcohol-soluble amino acids in the grains of 7275-13-1.