Claim · model-written summary
In the absence of potash, the better grasses declined and were replaced by poor grasses.
LoliumNot reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield of a ryegrass dominant sward”
e1“In the absence of potash with or without nitrogen the better grasses declined and were replaced by poor grasses”
t0“The intensive production of herbage for crop-drying Part V.”
Title
W. Holmes; D. S. Maolusky The Journal of Agricultural Science 1954. doi:10.1017/s0021859600046670
Other claims from this paper (18)
- Intervention effect Phosphate application did not affect herbage yield or crude protein content.
- Intervention effect Herbage yields were severely restricted in the absence of potash.
- Intervention effect Where potash was applied, yields under each nitrogen treatment were maintained or increased over the 6-year period.
- Observation Average dry matter yields with potash were 4760, 8050, 9620 and 9320 lb per acre per annum for nitrogen treatments 1 to 4.
- Observation Without potash, average dry matter yields were 3980, 5610, 5190 and 5100 lb per acre per annum.
- Observation With potash, average crude protein yields were 710, 1410, 1990 and 1640 lb per acre per annum.
- Observation Without potash, average crude protein yields were 550, 1090, 1190 and 1020 lb per acre per annum.
- Intervention effect Potash presence gave earlier growth in each season by maintaining earlier vigorous grasses.
- Observation Nitrogen treatments 2, 3 and 4 gave nearly uniform herbage production over the season, unlike the variable growth curve of treatment 1.
- Observation Weighted mean crude protein content ranged from 13·9% for treatment 1 to 20·6% for treatment 3 when potash was given.
- Observation Weighted mean crude protein content ranged from 12·9% for treatment 1 to 23·6% for treatment 3 when potash was absent.
- Observation Protein content increased gradually at later cuts in each season, with a smaller range where nitrogen was applied.
- Observation Nitrogen treatments 2, 3 and 4 gave an average response of 15·6, 10·8 and 11·8 lb dry matter per lb nitrogen compared with a no-clover sward.
- Observation Crude protein percentage recovery of applied nitrogen was 53, 44 and 42 for treatments 2, 3 and 4.
- Association Nitrogen recovery figures were reduced by about one-third in clovery swards compared with the sward yields.
- Observation Where both nitrogen and potash were adequate, a vigorous sward of ryegrass and timothy was maintained.
- Observation Where nitrogen was absent but potash present, a clovery sward developed.
- Intervention effect Where potash was applied, soil analysis showed no marked changes.