8/13/2019 Phosphoros Cotton Good

1/6

8/13/2019 Phosphoros Cotton Good

2/6

PPhosphorus

P uptake30 kg/ha

P removal20 kg/ha

P fertilizeraddition20 kg/ha

Most P (22kg)comes frominorganic P in the

soil (mainly Ca-P)

8 kg fertilizer Premains availablefor uptake

Unavailable inorganicsoil P compounds (12 kg)

Mobile in plantTHE CROP

needed for energyprocesses

PPhosphorus

MAPin alkalinesoil (pH>7)

DAPin acid

soil (pH2Unavailableinorganic soil Pcompounds

Superphosphates

Very littleleaching

Sample middleof hill to 30cm

Avoid samplingprevious

fertilizer zone

Sample same timeeach year

8/13/2019 Phosphoros Cotton Good

3/6

8/13/2019 Phosphoros Cotton Good

4/6

8/13/2019 Phosphoros Cotton Good

5/6

8/13/2019 Phosphoros Cotton Good

6/6