Nutrition and Fertilization Part 2

Question 1

Soil Microbial

Answer 1

8:1 in soil, need in bodies and as a source of energy 24:1 need

Question 2

What is the diving line between mineralization and immobilization of C:N

Answer 2

20:1

Question 3

Formula for Nitrate

Answer 3

nitrate concertation x inches irrigation applied x 0.052

Question 4

Formula for Nitrate-N

Answer 4

nitrate-N concentration x inches irrigated applied x 0.23

Question 5

What is nitrogen efficiency set at by the regulating agencies

Answer 5

70%

Question 6

What are the four Rs of Nitrogen

Answer 6

right rate, right time, right place, and right source

Question 7

When should nitrogen be applied

Answer 7

80% during 4 months of growth, 20% post hull split-pre leaf senescence

Question 8

Which tree can store Nitrogen better

Answer 8

Walnut, store in perennial tissues and survive short term N deficit

Question 9

peach nitrogen storage

Answer 9

stored in perennial tissues first 25-30 days, then 0.89lbs N per acre per day, much of N taken up by tree returned to the soil as leaf fall/pruning

Question 10

True or False: in nut tree the majority of annual N budget is exported from the orchard when we harvest the fruit

Answer 10

true, 80% uptake occurs from full leaf to hull split Almond, or by fruit maturity in Walnut/Pistachio, 20% after full maturity or immediately post-harvest

Question 11

How much nitrogen is left in peaches harvest?

Answer 11

15-20%

Question 12

Name three nitrogen fertilizer

Answer 12

anhydrous ammonia, urea, and urea solutions

Question 13

What is the almond, pistachio, walnut leaf sampling criteria

Answer 13

18-28 trees, 30 yards apart, 20 well exposed leaves, 5-7 feet from ground

Question 14

when do you collect samples for almond, pistachio, walnut

Answer 14

In April/May 35-45 days after full bloom, and July