Professor Moot Flashcards
What nitrogen % of the leaf results in 50% less photosynthesis?
1.5-4%
How much did cocksfoot yield in comparison with the potential with NO water and NO nitrogen?
25%
What % of a plants dry matter is usually Phosphorus?
0.3-0.4%
Explain the response of ryegrass to N when it is applied
Plants take up Nitrogen, leaves darken in colour. Leaf extension and tiller numbers increase. Tiller size and numbers increase which causes a yield increase.
What are the thermal time requirements for emergence of perennial ryegrass?
160 growing degree days
What are the thermal time requirements for emergency for White Clover?
150 growing degree days
List pasture yield with dryland, water and water + N and N (Mills)
Dryland = 6.3t/ha Water = 9.8t/ha N = 15.9t/ha Water + N = 21.9t/ha
What was the critical limiting water deficit of the cocksfoot pasture in the Mills experiment and yield decrease below this?
78mm. Every mm after this yield decreased at 1.45%
How did the days to weaning change for lambs on Bog Roy?
120-85 days
What % did flock performance improve at Bog Roy Station over 10 years?
80%
What effect does nitrogen have on water use efficiency? (WUE)
increased
Why are cocksfoot pastures always N deficient?
There is little to no clover growth due to the aggressive growth habit compared to clover
How does temperature affect pasture production?
Induces a seasonal effect which can’t be manipulated but is quantified through thermal time
How much nitrogen does 1t/ha of clover fix?
25kg N/T DM
What requirement % does pasture require of Nitrogen?
3.5%
In the Bog Roy Expiriment, how many hectares per year did Lucerne increase?
30ha per year
What was the alternative legume to Lucerne at Inverary Station?
Red Clover
On Inverary Station, what was the increase in meat production in 11 years?
130,000-145,000 with 1,000 less ewes
How much did the area of Lucerne at Bonavaree Station increase over 5 years and how did the economic surplus change?
130ha increase over 5 years, $120/ha above average
