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AlladinOne [14]
3 years ago
15

Effects of harrowing in the environment​

Geography
2 answers:
Anna [14]3 years ago
7 0

Answer:

To assess the effects of timing and frequency of weed harrowing on weed abundance and crop yield, different pre- and post-emergence weed harrowing sequences were applied to spring cereals and peas in field experiments performed during 2003 and 2004 in Sweden. Post-emergence harrowing was performed at crop growth stages 2–3 and 5–6 true leaves respectively. The best weed control was obtained by a combination of pre- and post-emergence harrowing, but these treatments also caused yield losses of 12–14% in spring cereals, while no yield losses were observed in peas.

Studentka2010 [4]3 years ago
5 0

Answer:

light and air pollution

Explanation:

i don't know what I can explain

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