как сеять пастибща или сенокосы чтобы получить удой или привес

ЗООТЕХНИК March 21, 2025
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Для ежегодного получения высокопродуктивных травостоев из многолетних трав и сырья высокого качества, ежегодная площадь перезалужения в хозяйстве должна составлять не менее 20-25%. Рекомендуется для подсева использовать травы интенсивного типа развития: кострец безостый, фестулолиум, овсяницу тростниковую, люцерну посевную, клевер луговой раннеспелый. При этом необходимо создавать травостои различных темпов созревания: раннеспелые —18%, среднеспелые — 50% и позднеспелые — 32% от площади кормовых посевов многолетних трав. В общей структуре травостоев бобовые должны составлять 54%, бобово-злаковые — 36% и злаковые — 10%. Лучшим сроком подсева трав является ранневесенний подсев (не позднее 2-3 дней после посева покровной яровой культуры), и подсев под озимые покровные при любой возможности выехать в поле. Недопустим поверхностный посев трав без заделки семян в почву. Ранние сроки сева предпочтительны для мятлика лугового, овсяницы красной, ежи сборной, лисохвоста лугового, полевицы белой и канареечника (двукисточника) тростникового. Более поздние — для овсяницы луговой, ежи сборной. К травам поздних сроков сева можно отнести тимофеевку луговую, мятлик болотный, райграс высокий. Оптимальный срок их посева – вторая половина июля – начало августа. Вполне допустим для всех видов злаков посев с шириной междурядий 25-30 см без междурядной обработки. Преимущества подпокровного весеннего посева состоят в том, что посевы меньше засоряются сорняками, преимущества же беспокровного весеннего посева заключаются в том, что такой посев дает возможность получать высокие урожаи семян уже с первого года пользования, а недостатки — в том, что такие посевы больше засоряются сорняками. Летние посевы злаковых трав рекомендуют проводить до 15 июля беспокровным способом и только при условии достаточного увлажнения, так как при летнем посеве из-за частых сухих периодов всходы сильно изреживаются и порой совсем гибнут. Посев в конце июля – августе нежелателен, так как высеянные в этот период травы могут не успеть до конца вегетационного периода хорошо раскуститься и образовать достаточное количество зимующих побегов. Урожайность семян в первый год использования таких посевов снижается на 20-30%. Практика показала, что не всегда удается получать хороший травостой при посеве трав под покров раноубираемых культур, поэтому рекомендуется закладывать семенники трав беспокровно и в чистом виде. Нормы посева злаковых трав на семена зависят от срока и способа посева, от плодородия, увлажнения участка и других факторов. Глубина заделки семян зависит от величины семян и механического состава почв. Семена мелкосемянных культур (полевица, мятлики, тимофеевка) на легких и средних почвах заделывают на глубину 1-1,5, а на тяжелых — до 0,5 см. Крупные семена злаковых трав на легких и средних почвах не следует заделывать глубже 3-4 см, а на тяжелых — до 1,5 см. Средние по величине семена на легких почвах заделывают на глубину 2-3 см, а на тяжелых — до 1 см. Важным агротехническим приемом при закладке семенников многолетних злаковых трав является до- и послепосевное прикатывание почвы. В условиях Беларуси минеральные удобрения необходимо вносить с учетом содержания фосфора и калия в почве. Примерные дозы фосфорно-калийных удобрений составляют: Р205 — 90-120, К20 — 120-180 кг/га как в основную заправку, так и ежегодно в подкормку рано весной. При этом калийные удобрения необходимо вносить дробно, не более 80 кг/га в один прием после каждого укоса. Микроудобрения более эффективно использовать при предпосевной обработке семян и внекорневой подкормке. Чтобы повысить всхожесть семян люцерны, их необходимо скарифицировать на скарификаторе или клеверотерке, которые нарушают твердую оболочку, и после этого семена во влажной почве быстро набухают и прорастают. Характерная особенность растений люцерны — сожительство (симбиоз) с клубеньковыми бактериями, образующими на ее корнях клубеньки. С этой целью семена перед посевом обрабатывают ризофосом. Ризофос можно приобрести в институте микробиологии.

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