Crop Production Lab 8 Soybeans

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16 Terms

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VE

emergence

<p>emergence</p>
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V1

first trifoliate

<p>first trifoliate</p>
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R1/R2

beginning/full flower

<p>beginning/full flower</p>
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R3/R4

Beginning/Full Pod

<p>Beginning/Full Pod</p>
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R5/R6

Beginning/Full Seed Development

<p>Beginning/Full Seed Development</p>
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R7/R8

Beginning/Full Maturity

<p>Beginning/Full Maturity</p>
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Intermediate Varieties

Vegetative growth continues even after reproductive flowers form. We grow this type in the North to maximize GDD. 

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Determinate Varieties

Stop vegetative growth after flowering.

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Maturity groups

categories based on duration of time from planting to physiological maturity. lower/early maturity groups are planted in Northern Climates (00,0,1,2’s). Southern climates plant later, higher maturity groups. 

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What color are healthy nodules

Healthy are pink; white, green, and gray are unhealthy.

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aphid

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grasshopper

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how do aphids eat?

they use piercing/sucking mouthparts to suck the plant sap. Leaves a stippling pattern on the leaves.

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How do grasshoppers eat?

round/ragged holes in the leaf caused by chewing.

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what conditions cause soybeans to grow slowly?

cold soil temp, pH outside 5.5-8.8 range, low moisture, extremely high soil temperature, nutrient deficiencies

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Soybean flower development is greatly influenced by?

Day length/photoperiodism, soybeans flower once day length decreases.