قراءة كتاب Crops and Methods for Soil Improvement
تنويه: تعرض هنا نبذة من اول ١٠ صفحات فقط من الكتاب الالكتروني، لقراءة الكتاب كاملا اضغط على الزر “اشتر الآن"
اللغة: English
الصفحة رقم: 4
class="txt"> An excess of nitrogen
CHAPTER XXI
| Tillage | 220-229 |
| Desirable physical condition of the soil | 220 |
| The breaking-plow | 221 |
| Types of plows | 221 |
| Subsoiling | 223 |
| Time of plowing | 223 |
| Method of plowing | 224 |
| The disk harrow | 225 |
| Cultivation of plants | 227 |
| Controlling root-growth | 227 |
| Elimination of competition | 228 |
| Length of cultivation | 229 |
CHAPTER XXII
| Control of Soil Moisture | 230-236 |
| Value of water in the soil | 230 |
| The soil a reservoir | 231 |
| The land-roller | 232 |
| The plank-drag | 233 |
| The mulch | 233 |
| Mulches of foreign material | 234 |
| Plowing straw down | 235 |
| The summer-fallow | 235 |
| The modern fallow | 236 |
CHAPTER XXIII
| Drainage | 237-246 |
| Underdrainage | 237 |
| Counting the cost | 238 |
| Where returns are largest | 239 |
| Material for the drains | 239 |
| The outlet | 240 |
| Locating main and branches | 240 |
| The laterals | 241 |
| Size of tile | 241 |
| Kind of tile | 242 |
| The grade | 243 |
| Establishing a grade | 243 |
| Cutting the trenches | 244 |
| Depth of trenches | 245 |
| Connections | 245 |
| Permanency desired | 246 |
ILLUSTRATIONS
| Alfalfa and Corn in Indiana | Frontispiece |
| Facing Page | |
| A Good Crop for a Poor Soil | 4 |
| Red Clover on Limed and Unlimed Land | 20 |
| Turning down Organic Matter with a Gang Plow | 36 |
| Red Clover on the Farm of P. S. Lewis & Son, Pt. Pleasant, W. Va. | 51 |
| Alfalfa on the Ohio State University Farm | 61 |
| Curing Alfalfa at the Pennsylvania Experiment Station | 68 |
| A Heavy Grass Sod in New York | 73 |
| Good Pasture Land in Chester County, Pa. | 90 |
| Sheep on a New York Farm | 96 |
| The Cowpea Seeded at the Last Cultivation of Corn in the Great Kanawha Valley, W. Va. | 106 |
| Texas Calves on an Ohio Farm | 121 |
| In the Fertile Miami Valley, Ohio | 126 |
| Concrete Stable Floors | 131 |
| Corn in the Ohio Valley | 140 |
| Penn's Valley, Pennsylvania | 151 |
| In the Shenandoah Valley |
