TABLE OF CONTENTS 



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 Re'sume', 521. 



XIX 



PAGES 



CHAPTER XXVII 



GREEN MANURES 



Effects of green-manuring, 522 Quantities of plant 

 constituents added by green-manuring, 523 Decay of 

 green manure, 524 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. 



619-626 



CHAPTER XXVIII 



LAND DRAINAGE . 



. 627-< 



Extent of drainage needed in humid regions, 531 

 History of drainage, 582 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, 589 

 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, 556 Silt basins, 557 Surface intakes, 

 658 Outlets, 559 Muck and peat soil, 560 Drain- 



