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961.
Two steers excreting similar quantities of organic matter daily were grazed at pasture during the summer of 1961. The four experiments each involved a preliminary period of five days dosing with Cr2 O3 to reach a fairly constant excretion. The steers received a daily dose of Cr2 O3 either in oil suspension or in shredded paper. The carriers and steers were interchanged for each trial. For two of the trials each steer in turn was harnessed every other day and all its dung collected in a bag. Total faecal excretion of organic matter was measured from the bagged steer and estimated from the Cr2 O3 concentration in a composite sample made up from all dung pats voided during the ten-day collection period. In the other two trials the steers were not harnessed and each dung pat was separately sampled and analysed for Cr2 O3 in the organic matter. The average recovery of Cr2 O3 in the first two trials was 99·1 (oil) or 94·4% (paper). Calculating the faecal organic matter excretion from the concentration of Cr2 O3 in the faeces and the quantity given daily overestimated it by 3·5 to 8·0%. There was no significant difference between shredded paper and oil as carriers of Cr2 O3 for estimating the quantity of organic matter excreted. There were 37% and 22% less variation between dung pats in Cr2 O3 concentration when this was administered in shredded paper than when given in oil suspension. 相似文献
962.
T. Lawrence 《Grass and Forage Science》1963,18(4):292-294
In Saskatchewan, intermediate wheatgrass ( Agropyron intermedium Host. Beauv.) suffered severe winter injury during the 1961–2 winter season, which followed a series of drought years, the most severe being 1961. In two tests, designed to study fertilizer effects, the extent of severe winter injury increased with the rate of application. The killing ranged from 4% where no fertilizer was applied to 90% where 66 lb of N per acre were applied. Slightly more winter-killing occurred after applications of ammonium phosphate/sulphate (16-20-0) fertilizer than after ammonium nitrate (33·5-0-0).
The grass growing in rows 36 in. apart killed out to a greater extent than that growing in rows 18 in apart Less winter injury occurred after spring applications of fertilizer than after application in the fall. 相似文献
The grass growing in rows 36 in. apart killed out to a greater extent than that growing in rows 18 in apart Less winter injury occurred after spring applications of fertilizer than after application in the fall. 相似文献
963.
Because in the past the main emphasis was placed on arable farming, grassland husbandry has played a minor role in East Anglia. Now the increased efficiency exercised in the arable farming of the area is being applied to the grasslands. The main trends are discussed. 相似文献
964.
The oral introduction of 0·5 g histamine as the diphosphate into the rumen of sheep produced no effect on the physiological condition of the animals. The feeding of histamine, as the dihydrochloride, in levels up to 1 g/day to sheep on silage diets did not affect the dry-matter intake. 相似文献
965.
A survey, covering some 140 fields, totalling 1540 acres, in Kent was conducted in 1961 on the effect of different methods of management on yields of perennial ryegrass and white clover seed. The main results were: (a) the majority of seed growers harvested seed from short-term leys and only a limited acreage of permanent pasture was used for producing seed. Yields of both ryegrass and clover seed were considerably higher on the younger leys; (b) the highest seed yields in 1961 were obtained from fields where sheep grazing was stopped on 24 May. However, a large number of growers continued sheep grazing well after this date: (c) mechanical defoliation, especially when used to supplement sheep grazing, proved an effective method for producing high yields of clover seed; (d) honey bees are important in increasing seed yields, particularly on recently sown leys; (e) combine harvesting from the swath was the most common method of harvesting and no instance of the use of tripods was reported. Seed yields from baling methods were generally low, but direct combining produced a high average yield of clover seed. From these results it was concluded that there was much scope for raising the general level of clover seed yields, especially by giving greater attention to details of management. 相似文献
966.
967.
Progress in development of chemical aids in suppressing andretarding forest fires and in drying vegetation to facilitatecontrolled burning is reviewed briefly. The main part of thepaper describes exploratory trials in 195861, using arange of fire-retardant compounds for control of grass and heathfires. All chemicals tested were markedly superior to plainwater in checking fire spread. Ammonium phosphate solution,and viscous water prepared using sodium alginate,were the most promising retardants tested, the latter beingthe more effective on heavier fuels such as heather and gorse.The costs and mechanics of use are discussed. Subject to operationaltrials, it is concluded that these chemicals could be of practicalvalue in checking the front and hottest parts of vegetationfires. Recent trials suggest that herbicides, of those testednotably Paraquat, may be used to desiccate grass vegetationto permit safe and rapid controlled burning during summer months. 相似文献
968.
969.
970.
D. R. Glendinning 《Euphytica》1966,15(1):116-127
Yields of cocoa varieties are positively correlated with the rate of trunk diameter increase prior to commencement of bearing, the correlation persisting over the years and not deriving only from faster-growing varieties being first into bearing. However yields seem to be more closely correlated, over early and intermediate years, with the difference between the rate of trunk diameter increase while in bearing and that in the pre-bearing period. Over these years there is a negative relationship between yields and the current rates of trunk diameter increase. Once varieties are well into bearing, current trunk diameters have little influence on yield.The rate of trunk diameter increase slows down until, in later years of bearing, it is almost nil. Then yields may be very closely correlated with the rates of diameter increase before bearing, which in effect are the same as the reductions in increment rates.A difference between varieties of 1.2 cms. per annum in the pre-bearing rate of trunk diameter increase seems to be roughly equivalent to a difference in yielding capacity of 1,600 lbs. dry cocoa per acre per annum. 相似文献