خيارات البحث
النتائج 1 - 10 من 88
Agricultural mechanization: methods and equipment for growing and harvesting of tobacco
1970
Alsidige foderrationers energetiske vaerdi til vaekst nos svin belyst ved forskellig metodik
1970
Neilsen, A. Just
Principles of growing stock classification for even-aged stands and an application to natural Douglas fir forests | Growing stock classification for even-aged stands and an application to natural Douglas fir forests
1970
King, James E.
Evaluation of bedding and supplemental heat for growing-finishing swine in open-fronted housing
1970
Foley, J. R. | Hinkle, C. N. (Charles Nelson) | Jones, Hobart W.
Factors affecting the metabolizable energy value of rapeseed meal for growing chickens and laying hens النص الكامل
1970
Lodhi, Gopi Nath
Factors affecting the metabolizable energy value of rapeseed meal for growing chickens and laying hens
1970
Lodhi, Gopi Nath
Factors affecting the metabolizable energy value of rapeseed meal for growing chickens and laying hens النص الكامل
1970
Lodhi, Gopi Nath.
A comparison of plastic dilution of diets with full and limited-fed diets for growing swine
1970
Boling, J.A. | Grummer, R.H. | Hauser, E.R.
A comparison of plastic dilution of diets with full and limit-fed diets for growing swine
1970
Boling, J. A. (James A) | Grummer, Robert H. | Hauser, E. R. (Edward Richard)
Measurement of Soil-grown Roots in a Rhizotron النص الكامل
1970
Taylor, H. M. | Huck, M. G. | Klepper, Betty | Lund, Z. F.
Measurements were made of both shoot and root growth on a corn (Zea mays L.) and a tomato (Lycopersicon esculentum Mill.) plant in a rhizotron. Root intensity at the transparent panel was estimated by two methods. It increased during the growing season for both species, but was always greater for corn. Estimates of root density and total root length were three times greater for corn than for tomato at the end of the growing season. Side walls and glass panels showed no concentrating effect on root growth.
اظهر المزيد [+] اقل [-]Forest Productivity Estimated from Carbon Dioxide Uptake النص الكامل
1970
Botkin, Daniel B. | Woodwell, G. M. | Tempel, Neal
Net photosynthesis of the three dominant tree species of the oak—pine forest of central Long Island was monitored intensively throughout one growing season to test the practicality of field measurements of net photosynthesis for estimating gross production of a forest. White Oak (Quercus alba) leaves absorbed 16.9 g CO₂/g of leaf during the growing season; scarlet oak (Q. coccinea) absorbed 9.9 g/g; pitch pine (Pinus rigida), 7.5 g/g. Previously published data integrated with the CO₂ exchange rates over the growing season gave a new estimate of gross production for the forest of 2,950 g dry matter/m² per year. This value is approximately 10—22% higher than previous estimates which were based principally on harvest techniques. The discrepancy between estimates emphasizes the difficulty of the measurements and the scale of the errors one must expect even with elaborate techniques.
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