RURAL REASONS. “This decline is in line with that of many other farmland species and is attributed to changes in farming practices: the switch from spring- to autumn-sown cereals; increased use of pesticides; increased use of herbicides; the switch from haymaking to cutting for silage before the grass has set seed; reduced spillage of grain and improved; storage to meet EU regulations.”
https://www.britishbirds.co.uk/wp-content/uploads/article_files/V96/V96_N09/V96_N09_P439_446_A004.pdf