CONTENTS 



PAGE 



The lysiineters and their treatment 9 



Construction of the lysimeters .• 9 



The soil used 10 



Manure and fertilizers used 13 



Soil treatment and cropping systems 13 



Corresponding field plats 15 



Quantity and rate of percolation 15 



Percentage percolation of rainfall 16 



Experiments by other observers 17 



Relation of flow to precipitation and season 25 



Effect of applications of lime on percolation 27 



Water utilization by crops 28 



Other experiments on water utilization by plants in lysimeters 31 



Sufficiency of moisture supply for crop growth , 33 



Removal of nitrogen from the soil in drainage water and in crops 36 



Relation of nitrogen removal in drainage water to total flow of drainage 37 



Effect of lime on removal of nitrogen 38 



Effect of plant growth on nitrogen removal in drainage water 40 



Relation of different crops to formation of nitrates 41 



Removal of calcium 43 



Effect of plant growth on removal of calcium 43 



Effect of lime on removal of calcium 46 



Effect of potassium sulfate on removal of calcium , 47 



Percentage of calcium in plants 48 



Sufficiency of the lime application 49 



Removal of magnesium 49 



Effect of plant growth on removal of magnesium 50 



Effect of lime on removal of magnesium 51 



Effect of lime and potassium sulfate on removal of magnesium 52 



Percentage of magnesium in plants 53 



Calcium-magnesium ratio 54 



Removal of potassium 54 



Effect of plant growth on removal of potassium 55 



Effect of lime on removal of potassium 58 



Effect of potassium sulfate on removal of potassium 60 



Removal of sodium .- 61 



Effect of plant growth on removal of sodium 61 



Effect of lime on removal of sodium 62 



Effect of potassium sulfate on removal of sodium 63 



Effect of potassium sulfate on total quantity of bases in drainage water 64 



Other experiments on loss of bases 65 



Bases in drainage water from field soils 69 



Removal of sulfur 72 



Effect of plant growth on removal of sulfur 72 



Effect of lime on removal of sulfur 73 



Effect of potassium sulfate on removal of sulfur 74 



Other experiments on removal of sulfur in drainage water 75 



Removal of phosphorus 78 



Summary 79 



Bibliography 82 



Appendix 85 



3 



