- About
-
The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 371 to 380 of 1384 (0.038 seconds)Spelling suggestions: "subject:"fertilizers."" "subject:"fertilizer’s.""
| 371 |
Effects of ammonium phosphate on a Southern Arizona desert grassland rangeTixier, John Stanley, 1932- January 1959 (has links)
No description available.
|
| 372 |
Influence of manure disposal on soil nitrogenSnitzer, Stanley, 1945- January 1975 (has links)
No description available.
|
| 373 |
The relation of potassium exchange equilibria and yield responses of oats, barley and corn on some selected Quebec soils.Zandstra, Hubert G. January 1966 (has links)
No description available.
|
| 374 |
Slow release vs. fast release sources of nitrogen : effects on soil nitrogen content and corn growth.Miller, Percy L. January 1973 (has links)
No description available.
|
| 375 |
A comparison of the effects of ammonium nitrate vs manure nitrogen on corn (Zea mays L.) growth.Bosshart, Jon January 1977 (has links)
No description available.
|
| 376 |
The biological control of odours emanting from piggery slurryWilliams, A. G. January 1981 (has links)
No description available.
|
| 377 |
The role of sediment-associated transport in the nutrient budget of a small Devon catchmentGarrett, Keith John January 1992 (has links)
No description available.
|
| 378 |
Effect of the wetting and drying of soils on phosphate sorptionOlsen, R. January 1980 (has links)
No description available.
|
| 379 |
Potential uses of bracken (Pteridium aquilinum (L.) Kuhn) in organic agriculture in ScotlandDonnelly, Eric January 2003 (has links)
To assess the availability of bracken and the factors influencing frond yields, this thesis investigated the growth and phenology of bracken populations across Scotland in relation to site characteristics. The change in elements in fronds and litter from April to November was analysed, along with the concentrations of the carcinogen Ptaquiloside (Pta). Frond dry matter yields increased to maximum in August/September, falling to those in November. In September/October, frond yields ranged from 4.70-15.9 DM t ha<sup>-1</sup>. Frond concentrations of phosphorus and potassium reduced, and concentrations of calcium and magnesium increased from May to November. Frond Pta concentrations reduced during this period also, with the highest concentration recorded of 5792 mg kg<sup>-1</sup> in May 2002 at Loch Grannoch, SW Scotland. This thesis also investigated the effects of harvesting of fronds, and the burning and clearing of litter on the yield of frond dry matter, yield and content of ash and on Pta concentrations in fronds. The concentration of twenty-one elements, the CaCO<sub>3</sub> equivalence and pH of this ash were determined, and the effect of harvesting of fronds on subsequent yields was assessed. Harvesting during the growing season reduced the preceding yield of fronds, but not if harvested after senescence. A positive regression was found between frond DM and ash yields. The maximum yield of K in ash was harvested in August/September, at around 180 kg ha<sup>-1</sup>. Calculations of the value of bracken ash using August 2001 K concentrations and the cost of other organic K sources came to between £219-£980 t<sup>-1</sup>. The ash produced had a mean pH of 11.9, and mean calcium carbonate equivalence of 52%. Lifting litter increased the density of fronds, and burning litter increased the soil available Mg concentrations and Ca concentrations in the ash. Pta concentrations in fronds that emerged in reaction to harvesting were higher compared to those fronds first harvested at the same time.
|
| 380 |
The relationship of antifungal compounds and mycotoxins in animal feedsHarley, R. M. January 1985 (has links)
No description available.
|
Page generated in 0.0418 seconds