Abstract: In order to search out the suitable controlled released Blend Bulk fertilizer used for Green Chinese onion,field experiment was conducted. The effects of controlled release Blend Bulk fertilizers on fresh weight,stem length,and nutrients of Green Chinese onion were investigated,at over-summer-period(from August to September), luxuriant-growth-period (from September to October), cauloid-enrich-period(from October to November) and harvest-period (16th,November). The results suggested that: after treated with controlled release Blend Bulk fertilizers II (CRBBF II) with N－P₂O₅－K₂O is 14∶ 9∶ 18,and compared with treated with customary fertilizer application,the fresh weight of Green Chinese onion increased by 2. 6%－58. 9%,stem length(October and November ) increased by 6. 9%－8. 4%,N,P₂O₅ and K₂O recovery efficiency increased by 0. 58－8. 18,0. 46－8. 25,0. 57 －7. 77 percentage point respectively. The CRBBF II was the best fertilizer application pattern in this experiment. The amount of N release after CRBBF II has been applied to soil for 80 days should be increased. Potassium release should be 10－20 days earlier.

Key words: Controlled release Blend Bulk fertilizer, Zhangqiu Green Chinese onion, Fresh weight, Stem length, Nutirent

CLC Number: 

• S14