Premature
2020-04-14 16:08:25
Scientific name Poa annua L. It is an annual or new-year herb of grasses. Alias ​​slightly grass, small grass, chicken grass, cold grass, pompon grass. Most of the southern and northern provinces and cities are distributed. The main damage is wheat, rape, vegetables, fruit trees and so on.
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Morphological characteristics Stem stalks are weak, clustered, erect or slightly inclined, plant height 8-30cm. Leaf sheaths were mostly closed below the middle of the plant and were glabrous; ligules were round head membranes; leaf texture was soft; panicles developed, with 1 to 3 branches per branch and 3 to 5 spikelets; Thin, one pucker shorter than two, with 1 veins, 2 veins with 2 veins, lateral margin and apical membranous, 5 veins, hairs below ridge and marginal veins, glabrous between veins, and some basal Fluffy, with no fluff on the base; a 3–4mm length on the outside, with lengths or slightly shorter inside and outside, and villous hair on the ridge. Carrot near spindle. Seed breeding.
Ecological characteristics are born on wet grass, roadsides, or damp land plots.
Shanghai began heading in mid-February. Seeds began to ripen in mid-April and late April. After 1 to 2 months of dormancy, they began to emerge in early September and peaked in October-November. Partial occurrence occurred in early March and early March in the following year. Seed germination temperature is 5-23 °C, with 15-20 °C optimum, can emerge in 0-5cm soil layer, with 0-3cm soil layer seedlings best. In 10% to 40% moisture content of soil germination, soil moisture content of 15% to 30% of the highest germination rate.
Morphological characteristics Stem stalks are weak, clustered, erect or slightly inclined, plant height 8-30cm. Leaf sheaths were mostly closed below the middle of the plant and were glabrous; ligules were round head membranes; leaf texture was soft; panicles developed, with 1 to 3 branches per branch and 3 to 5 spikelets; Thin, one pucker shorter than two, with 1 veins, 2 veins with 2 veins, lateral margin and apical membranous, 5 veins, hairs below ridge and marginal veins, glabrous between veins, and some basal Fluffy, with no fluff on the base; a 3–4mm length on the outside, with lengths or slightly shorter inside and outside, and villous hair on the ridge. Carrot near spindle. Seed breeding.
Ecological characteristics are born on wet grass, roadsides, or damp land plots.
Shanghai began heading in mid-February. Seeds began to ripen in mid-April and late April. After 1 to 2 months of dormancy, they began to emerge in early September and peaked in October-November. Partial occurrence occurred in early March and early March in the following year. Seed germination temperature is 5-23 °C, with 15-20 °C optimum, can emerge in 0-5cm soil layer, with 0-3cm soil layer seedlings best. In 10% to 40% moisture content of soil germination, soil moisture content of 15% to 30% of the highest germination rate.
Precursors NO
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