Professor Moot

Question 1

What nitrogen % of the leaf results in 50% less photosynthesis?

Answer 1

1.5-4%

Question 2

How much did cocksfoot yield in comparison with the potential with NO water and NO nitrogen?

Answer 2

25%

Question 3

What % of a plants dry matter is usually Phosphorus?

Answer 3

0.3-0.4%

Question 4

Explain the response of ryegrass to N when it is applied

Answer 4

Plants take up Nitrogen, leaves darken in colour. Leaf extension and tiller numbers increase. Tiller size and numbers increase which causes a yield increase.

Question 5

What are the thermal time requirements for emergence of perennial ryegrass?

Answer 5

160 growing degree days

Question 6

What are the thermal time requirements for emergency for White Clover?

Answer 6

150 growing degree days

Question 7

List pasture yield with dryland, water and water + N and N (Mills)

Answer 7

Dryland = 6.3t/ha Water = 9.8t/ha N = 15.9t/ha Water + N = 21.9t/ha

Question 8

What was the critical limiting water deficit of the cocksfoot pasture in the Mills experiment and yield decrease below this?

Answer 8

78mm. Every mm after this yield decreased at 1.45%

Question 9

How did the days to weaning change for lambs on Bog Roy?

Answer 9

120-85 days

Question 10

What % did flock performance improve at Bog Roy Station over 10 years?

Answer 10

80%

Question 11

What effect does nitrogen have on water use efficiency? (WUE)

Answer 11

increased

Question 12

Why are cocksfoot pastures always N deficient?

Answer 12

There is little to no clover growth due to the aggressive growth habit compared to clover

Question 13

How does temperature affect pasture production?

Answer 13

Induces a seasonal effect which can’t be manipulated but is quantified through thermal time

Question 14

How much nitrogen does 1t/ha of clover fix?

Answer 14

25kg N/T DM

Question 15

What requirement % does pasture require of Nitrogen?

Answer 15

3.5%

Question 16

In the Bog Roy Expiriment, how many hectares per year did Lucerne increase?

Answer 16

30ha per year

Question 17

What was the alternative legume to Lucerne at Inverary Station?

Answer 17

Red Clover

Question 18

On Inverary Station, what was the increase in meat production in 11 years?

Answer 18

130,000-145,000 with 1,000 less ewes

Question 19

How much did the area of Lucerne at Bonavaree Station increase over 5 years and how did the economic surplus change?

Answer 19

130ha increase over 5 years, $120/ha above average