TABLE OF CONTENTS xix 



PAGES 



the field, 508 — Cement pit, 509 — Covered barnyard, 

 510 — Piles outside, 511 — Distribution of manure in the 

 field, 512 — Reinforcement of manure, 513 — Benefits 

 from reinforcing, 514 — Lime and manure, 515 — Com- 

 posting, 516 — Manure and muck, 517 — Effects of ma- 

 nure on the soil, 518 — Residual effect of manure, 519 — 

 Place of manure in the rotation, 520 — Resume^ 521. 



CHAPTER XXVII 



Green Manures 619-626 



Effects of green-manuring, 522 — Quantities of plant 

 constituents added by green-manuring, 52:} — Decay of 

 green manure, 624 — Crops suitable for green manures, 

 525 — When to use green manures, 526 — When to turn 

 under green crops, 527 — How to turn under green mate- 

 rial, 528 — Green manures and lime, 529 — Green manure 

 and the rotation, 530. 



CHAPTER XXVIII 



Land Drainage 627-662 



Extent of drainage needed in humid regions, 531 — 

 History of drainage, 532 — Effects of land drainage on 

 the soil, 533 — Methods of drainage, 534 — Construction 

 of small open ditches, 535 — Construction of large open 

 ditches, 536 — Construction of early types of under- 

 drains, 537 — Stone drains, 538 — Tile drains, 539 — 

 Quality of tile, 540 — Shapes of tile, 541 — Protection of 

 joints, 542 — Entrance of roots into tile, 543 — Protection 

 of joints on curves, 544 — Foundation for tile, 545 — 

 Arrangement of drainage systems, 546 — 'Grade of tile 

 drains, 547 — Depth of drains, 548 — Distance between 

 drains, 549 — Construction of drainage trenches for tile, 

 650 — Laying tile, 551 — Size of tile, 552 — Amount of 

 water to be removed from land, 553 — Carrying capacity 

 of a tile-drain system, 554 — Cost of drainage, 555 — 

 Storm channels, 550 — Silt basins, 557 — Surface intakes, 

 558 — Outlets, 559 — Muck and peat soil, 560 — Drain- 



