10/11/13

The homework for the long weekend is to:

1. Thoroughly read the Background for the Testing Soil Productivity Lab
2. Complete Assignment 12 (the questions are located in the previous post)

Class Data

Activity 1 – Water Capacity (mass of water held / mass of soil)

Sand	Clay	Humus	Local Soil
0.15	0.7	0.25	0.4

Less than 0.4 = Low capacity for holding water

0.4 to 0.6 = Moderate capacity

Greater than 0.6 = High capacity

Activity 3 – Soil Nutrients

	Local Soil
pH	7
Nitrogen	0 ppm (depleted)
Phosphorus	10 ppm (adequate)
Potassium	600 ppm (sufficient)

Activity 4 – Soil Permeability

	Sand	Clay	Humus	Local Soil
Time until 1st drop fell	10	? (Student data would be nice!)	3	6
Time until last drop fell	90	?	60	60

Activity – Soil Particle Composition

	Humus	Local Soil
% Sand	67	37
% Silt	18	33
% Clay	15	30