This book is on flowering shrubs suitable for growing in Indian gardens. It includes the best of the species and varieties capable of growing vigorously under most of the soil and climatic conditions prevalent in India and those having a growth habitat that makes them a decorative feature of the garden.

Soil moisture during the growing season and radial tree growth were significantly increased by impounding winter and spring rainfall until July 1 on hardwood sites in the Mississippi Delta. In early July, the average moisture per 30 cm of soil amounted to 19.5 cm for the area that had been flooded and 13 cm for the control soil. Even late in the growing season, soil in the impoundment contained about 1 cm more moisture. Timber growth was increased by about 50%. Oxygen in the water was depleted after 15 days of dry weather, but was quickly replenished by rain.

S2Once a forest owner has decided to develop his property for timber production, his first concern is for the direction of development. This involves questions of species composition, method of management (even-aged or uneven-aged), and type of products to manage for. After these decisions are made, two basic problems arise. The first problem is to determine the optimum level of development for the ownership. This involves the questions of how much growing stock to carry; how far to go in trying to establish, protect, and improve growing stock; and how much investment in roads and other physical improvement is justified. The second problem is to decide how fast to move toward this optimum level of development.S3.

The hypothesis that variation in dates of the beginning and end of growing seasons of eastern cottonwood (Populus deltoides Bartr.) and American sycamore (Platanus occidentalis L.) can be attributed to variation in air temperature andphotoperiod was tested by using data collected during a single year (1963) from trees widely distributed throughout their natural ranges. Dates of bud breaking and winter—bud formation were used as the criteria for the beginning and end of growing seasons. Correlation and regression analyses were used to elicit the relationships of these dates with latitude, altitude, air temperature, photoperiod, and with the dates of frost occurrence at the locations of the sampled trees. The growing season in these two species was not confined to the period between killing frost in spring and fall. The lengths of growing seasons were inversely related to the latitude. With increasing latitude, growth began later and stopped earlier. Both air temperature and photoperiod at the time of growth initiation and cessation varied with latitude. At a given latitude between 30°N and 50°N cessation of growth occurred at higher temperature than that at initiation of growth, and growth cessation between 33°N and 50°N was associated with shorter photoperiods than those at growth initiation. Temperature and photoperiod, acting in combination, appeared to be important, although not exclusive, factors in controlling the initiation and cessation of growth of these species. The regression line of monthly mean temperature on photoperiod on the day of growth initiation appeared to delineate a boundary between the period of dormancy and the active growing season. The cessation of growth could not be as clearly defined.

The importance of the wheat plant needs no emphasis. Among the cereals it is second to none in economic importance and in total yearly production. In New Zealand, of course, it is the most important of all arable crops; its production and the acreage of land devoted to its growing continue to increase (Copp, 1962-64; N.Z. Wheat Rev. 9:11-19). Although catastrophic droughts, such as those known in U.S.A., U.S.S.R. and India, are not known in the wheat growing areas of New Zealand, yields are quite often dependent on the availability of water. This is particularly true in the growing areas of the Canterbury Plain. It is very surprising that virtually no work has been done in New Zealand on the effect of drought on the yield of this important crop. Investigations seem to be concentrated on the disease aspects and on mineral requirements of the plant. The present investigation was, therefore, intended to give some indication of the drought susceptibility or resistance of New Zealand wheats. It was designed to compare the sensitivity (expressed in grain yield) of the different stages of development of the plant to soil-moisture stress. The stages of growth chosen for the imposition of the drought treatment are those currently thought to be critical in moisture availability. For the sake of simplicity only mother shoots were used in the study - all other tillers being removed soon after they appeared. Two New Zealand varieties, Arawa and Hilgendorf '61, were used - both of which are widely grown in the South Island. These two varieties were chosen because they differ in the make-up of their yield (Langer, 1965), and it seemed likely that this would be reflected in their reaction to drought imposed at different stages of development.

An inventory of total Cs¹ ³ ⁷ distribution in a 500—m² tagged tulip poplar (Liriodendron tulipifera) forest at the Oak Ridge National Laboratory showed transfer from trees to soil during the first growing season. About one—third of the maximum amount of radiocesium found in the tree canopy during June was transferred to the forest floor and soil; the remainder moved back into woody tissue (stem and roots) before leaf fall. Losses of radiocesium from the foilage and stems into the plot area through litterfall (55 μc/m²) and rain leaching (13 μc/m²) accounted for almost 8% (68 μc/m2) of total Cs¹ ³ ⁷ (934 μc/m²) introduced into tree boles. However, soil (including roots) and litter sampling at the end of the growing season indicated a much larger quantity (414 μc/m² or 45% of initial input) already in the surface 30—cm layer of mineral soil. Of the total Cs¹ ³ ⁷ activity found within the mineral soil layer, about half can be physically associated with the tagged trees removal of roots from soil samples and cumulative measurement of surface income at time of soil collection. Much of the remainder can be accounted for by contact exchange, root exudation, root death, and leaching of roots by soil solution.

Nursery experiments have shown that sulfur-coated urea was excellent as a slowly available form of nitrogen for ornamental plants in containers. Best plant growth resulted when the sulfur-coated urea was incorporated in the potting mix and the plants received fertilizer applications during the growing season. Even without additional fertilization, the controlled-release urea was able to supply adequate amounts of nitrogen for several months' growth. Excessively heavy applications resulted in plant injury and death.