Date post: | 13-Dec-2015 |
Category: |
Documents |
Upload: | shanon-florence-price |
View: | 219 times |
Download: | 0 times |
Soybeans!!!
Soil Fertility-pH of 6.2 to 7.0
-pH controls: lime (acid), anhydrous
ammonia (base)-Potassium - 1.4 lbs. per acre
-Phosphorous - .8 lbs. per acre
-Nitrogen: from atmosphere and soil nitrates
Soybean Diseases-Phytophthora Root Rot
-Sclerotinia Root Rot
-Brown Stem Rot
-Phomopsis seed rot
-Soybean Cyst Nematode
Phytophthora Root Rot-Caused by fungus from moisture
-First seen in Ohio in 1951-Common in poorly drained, compacted soils.
Controlling Phtyo. Root Rot-Use of fungicides
-Use resistant varieties-Use well-drained soils
-Keep compaction to minimum
Sclerotinia Stem Rot Prevention
-15 inch row spacing, more air circulation
-Limited crop rotation, prevent spread
-Using resistant varieties
Brown Stem Rot Prevention-Intense crop rotation
-Use of no-till
-Use resistant varieties
-Narrow row widths
Phomopsis Seed Rot-Occurs in delayed harvest due to
wet, rainy weather
-Caused by three different fungi, and can survive winter
Phomopsis Seed Rot Prevention-crop rotation with wheat and corn
-Seed treatment for seed lots with low levels of infection (70 to 90% germination)
-plow down crop residues for fields with heavy disease pressure
Soybean Cyst Nematode-microscopic roundworm, 1/64 inch in length
-penetrates roots and feeds on
vascular system.
-can’t reproduce without host