Prof. Dr. Zkaria M. El-SirafyDr. Ayman M. EL Ghamrey Mansoura University

: Soil Fertility : Available Nutrient

: Field investigation . . . .

6. 7. 8. . 9. . 10.

Plant Analysis (1) :

Naked eye Magnifying glass Microscope

Nitrogen (N) () . Phosphorus (P) ( )

Potassium (K) ( ) . Calcium (Ca)

Magnesium (Mg) ( ) Sulfur (S)

Iron (Fe)

Zinc (Zn) .

Manganese (Mn) .

Cupper (Cu) .

Boron (B) () Molybdenum (Mo) . .

(2) Leaf analysis . () Latest mature leaf .

: . . .

(3) . . .

:

(5-6 ) . . . Luxury Consumption Toxicity .

: Soil Analysis (1) (2) Weeds(3) ( ) (4)

1 - : Complete soil Analysis . 2 - Weeds 3 - 4 - (10 ) 5

Soil Sampling(1) Composite Sample 8-10 (2) Site Specific Samples (3) Grid Samples (4) Directed or Judgment sample

. ( 15-30) N Soil Tests P Soil Tests K Soil Tests

: (1) Micro organisms methods (2) Plant methods

: Field experiments Pot experiments

Calibration Standards : (1) relative yield

2) Plant nutrient content .(3) . () Acute Latent

: Chemical methods(1) Konig 1% 1% .

: Chemical Biological Methods (Neubouer) . : 100 50 250 100 . 70-80 3 3 . . .

5- 17 /100 . 6- ( ) . 7- /100 / 12 . 6 / 100 P2O5 24 /100 K2O

: Biological methods Field Experiments field experiments

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