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2024年秋冬季大白菜科學施肥指導意見
2024-10-06
09:05:00
來源:全國農技推廣中心 閱讀量:19992
評論
施肥原則
針對大白菜生產中有機肥施用量不足,偏施氮肥、單次施肥量過大,盲目施用高磷復合肥,蔬菜地土壤酸化等問題,提出以下施肥原則:
(1)合理施用有機肥料,減少化肥用量,提倡施用腐熟的農家肥或商品有機肥,忌用沒有充分腐熟的有機肥料,有機無機配合施用。
(2)依據土壤肥力和目標產量,優化氮磷鉀肥用量。
(3)根據不同生育期養分需求,基肥追肥相結合,追肥以氮鉀肥為主,適當補充微量元素。施用增效肥料,提高肥料利用效率,降低養分損失。
(4)北方石灰性土壤有效硼含量較低,南方酸度大的土壤有效鉬含量較低,應注意微量元素的補充。
(5)土壤酸化嚴重時應適量施用石灰。
(6)施肥與高產栽培結合,選育高產耐密品種,提高育苗質量,采用合理種植密度,選擇適宜播期/移栽期。
施肥建議
(1)產量水平8000—10000公斤/畝,施充分腐熟的優質農家肥3—4方/畝或商品有機肥300—400 公斤/畝。氮肥(N)20—25公斤/畝,磷肥(P2O5)7—9公斤/畝,鉀肥(K2O)20—25公斤/畝。
(2)產量水平6000—8000公斤/畝,施充分腐熟的優質農家肥3—4方/畝或商品有機肥300—400 公斤/畝。氮肥(N)15—20公斤/畝,磷肥(P2O5)5—7公斤/畝,鉀肥(K2O)15—20公斤/畝。
(3)產量水平4500—6000公斤/畝,施充分腐熟的優質農家肥2—3方/畝或商品有機肥200—300 公斤/畝。氮肥(N)10—15公斤/畝,磷肥(P2O5)4—6公斤/畝,鉀肥(K2O)10—15公斤/畝。
(4)產量水平3500—4500公斤/畝,施充分腐熟的優質農家肥2—3方/畝或商品有機肥200—300 公斤/畝。氮肥(N)8—10公斤/畝,磷肥(P2O5)3—4公斤/畝,鉀肥(K2O)8—10公斤/畝。
(5)基肥重視有機無機配合施用,全部有機肥和磷肥以條施或穴施方式作基肥,氮肥30%作基肥,70%分別于蓮座期和結球前期結合灌溉分兩次作追肥施用,注意在包心前期追施鉀肥,占總施鉀量的50%左右。雨水豐沛或土壤肥力水平較低的地塊,提倡施用含脲酶抑制劑、硝化抑制劑的氮肥。在低溫、寡照等極端環境下,可施用含氨基酸、黃腐酸、海藻酸等功能性物質)的肥料。
(6)微量元素硼缺乏的地塊,可于播種前基施硼砂1公斤/畝,或于生長中后期用0.1%—0.5%的硼砂或0.1%—0.2%的糖醇硼水溶液進行葉面噴施,每隔5—6天噴一次,連噴2—3次。大白菜為喜鈣作物,除了基施含鈣肥料(如過磷酸鈣)以外,還可葉面噴施0.3%—0.5%的氯化鈣或硝酸鈣溶液。南方菜地土壤pH<5時,每畝施用生石灰100—150公斤,可調節土壤和補充鈣素。
來源:農業農村部種植業管理司、全國農業技術推廣服務中心、農業農村部科學施肥專家指導組
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