包膜尿素不同用量对黄瓜幼苗生长及氮平衡的影响

为确定合理的包膜尿素用量以指导黄瓜育苗施肥,采用生产中常用的草炭:蛭石(2:1)为育苗基质,研究了包膜尿素不同用量对黄瓜幼苗生长、养分吸收及氮平衡的影响。结果表明:包膜尿素用量在125~375 mg N/株的情况下,可协调黄瓜幼苗地上部和地下部的生长,促进幼苗对磷、钾的吸收;移栽时,基质中的氮素残留总量90.5~250.3 mg N/株,其中,残留的包膜氮素占75.4%~82.3%,可实现带肥移栽;育苗期间可产生31.9~121.5 mg N/钵的氮素表观损失。

The Effect of Coated Urea Application Rate on Seedling Growth and Nitrogen Balance During Cucumber (Cucumis sativus L.) Nursery Period

To determine a reasonable application rate of coated urea for cucumber seedling fertilization, taking conventional substrate, peat: vermiculite (2:1), as seedling medium, seedling growth, nutrients uptake and nitrogen (N) balance were tested in this study during cucumber nursery period with different application rate of coated urea. The results showed that coated urea application rate at 125-375 mg N per plant could coordinate the growth of shoot and root of cucumber seedlings, and improve phosphorus and potassium uptake. Meanwhile, residue of 90.5-250.3 mg N per plant was found in the substrate at transplanting time, among them, the coated N accounted for 75.4%-82.3%, and could realize fertilized-transplanting. 31.9-121.5 mg N per pot apparent N losses occurred during nursery period.