144 FERTIUTY AND FERTILIZER HINTS 



NOTES. 



The following notes refer to tables, experiments, statistics, 

 discussions and other interesting data that may be found in 

 Halligan's Soil Fertility and Fertilizers : 



Page 3— A discussion on evidence to show that other plants gather nitro- 

 gen trom the air. 

 Page 5— Distribution of elements in the earth's crust and air; composition 



of the air. 

 Page 8 — Table showing the elements that make up plants. 

 Page 9 —The distribution of the mineral elements in plants and a full dis- 

 cussion of the ash in plants. 

 Page II — The per cent, of ash and the mineral elements that constitute the 



ash are given for several vegetable substances. 

 Page 14 — Table of the amount of plant food in typical American soils from 



different states. 

 Page 15— Estimates of plant food in soils with yields of crops. 

 Page 18 — Table of temperatures of different classes of soils. 

 Page 18 — The average mean monthly range in temperature of the air and 



soil for twelve years at Lincoln, Nebraska. 

 Page 18— Standard measurements of soil particles and mechanical analyses 



of soils. 

 Page 19— Table of chemical and mechanical composition of different types 



of soils. 

 Page 21 — Table showing the upward movement of water in different types 



of soils. 

 Page 22— A table showing the number of bacteria found in a gram of soil 



during some part of the growing period. 

 Page 22— Two tables that demonstrate how manure helps nitrification at 



different periods of the growing season. 

 Page 26 — Composition of drainage waters from plots of a wheat field. 

 Page 26— Table giving the amounts of nitrogen removed by different farm 



crops. 

 Page 27— Data showing the amount of nitrogen lost from bare soils and 



wheat land ; comments on the same. 

 Page 34 — Data concerning the effect of a rotation of crops on the humus 



supply. 

 Page 34 — Crop rotations practiced in different sections of the United States. 

 Page 34— Fertility removed by farm produce ; loss of fertility by exclusive 



grain farming and stock farming. 

 Page 36— Tables showing actual results obtained from different kinds of 



animals performing different kinds of work on the value of manure. 

 Page 36 — Composition of straws, leaves and sawdust. 



