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The composition and manurial value of poultry excreta, straw‐droppings composts and deep litter. IV. —Results of manurial trials, and general conclusions
Author(s) -
Tinsley J.,
Nowakowski T. Z.
Publication year - 1959
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740100406
Subject(s) - straw , compost , dry matter , agronomy , organic matter , deep litter , nitrogen , litter , phosphorus , poultry litter , chemistry , composition (language) , nutrient , zoology , biology , linguistics , philosophy , organic chemistry
Results of previous manurial trials with poultry droppings and bulky organic manures are reviewed in relation to experiments designed to compare the manurial values of fresh droppings, composts prepared from straw and droppings, and of deep litter, with ammonium sulphate as a standard nitrogen fertiliser. A pot trial with spinach beet and two field trials with potatoes were conducted using adequate basal quantities of phosphate and potassium in order to test the availability of the nitrogen in the organic manures. In the pot trial and in one of the field trials during a wet season, good agreement was obtained between the amount of nitrogen soluble in cold o.IN‐sulphuric acid and crop responses, but in the second field trial in a dry season, very different results were obtained. Deep litter has several advantages over composts: thus it affords a more economical means of absorbing droppings, it is more concentrated in organic matter and it requires only half the weight to provide the same quantity of dry matter. Under moist soil conditions, half the total nitrogen in fresh droppings and deep litter may be equivalent to ammonium sulphate, but the proportion in composts depends on the initial composition and state of maturity of the compost. Suggestions are made for further work, particularly with large heaps stored under cover for one to three years.