The invention discloses a controlled-release compound fertilizer for cucumber seedling raising and its preparation method, which consists of the following components: coated urea 10_12, ammonium nitrate phosphorus 2_4, phosphorus fertilizer 3_4 and potassium fertilizer 3; coated urea consists of urea and coated material, the mass percentage of nitrogen in coated urea is 44%, the initial dissolution rate is greater than 0 and less than 2%, and the nutrient release period is 40_50 days. The mass percentage of N in ammonium phosphate nitrate is 30%-32%, and that of P2O5 in ammonium phosphate nitrate is 4%-6%. The invention takes coated controlled-release urea as the main nitrogen supplier, and adds appropriate amount of ammonium nitrate phosphorus, phosphorus fertilizer and potassium fertilizer to synchronize the nutrient supply with the nutrient demand during cucumber seedling growing period. While stimulating the root growth and development of cucumber seedlings, the controlled-release nitrogen not released during transplanting is retained in the rhizosphere to meet the nutrient demand of plant roots after transplanting, so as to slow down the seedling ahead of time and promote plant growth. Long purpose.
【技术实现步骤摘要】
一种黄瓜育苗控释复混肥及其制备方法
本专利技术属于农业种植
,具体涉及一种黄瓜育苗控释复混肥及其制备方法。
技术介绍
黄瓜是重要的蔬菜作物,在我国蔬菜栽培中占有重要的地位。我国黄瓜栽培具有栽培面积大,形式多、总产量高的特点。育苗移栽以其充分利用生长季节、提前生育进程、密植全苗等优点广泛应用于我国黄瓜生产。在黄瓜育苗移栽生产体系中,黄瓜幼苗移栽前长势弱,根系发育不良,植株不健壮;移栽时根系损伤严重,植株对水分和养分的吸收困难,导致移栽后缓苗时间长,恢复慢,是影响黄瓜田间生长和产量的两个重要原因。解决这一间题的关键在于:一方面,育苗期注重养根,根好、苗壮,黄瓜则不会出现长势差、缓苗慢等现象,有利于提高植株的抗病、抗虫性,为后期丰产打下良好的基础;另一方面,移栽后根系附近(即根际)保持适宜的养分浓度,有利于提高植株吸收养分的生物有效性,达到快速缓苗的目的。育苗期问养分供应浓度和养分形态直接影响黄瓜幼苗的生长状况,并进一步影响移栽后植株的生长发育、产量和果实品质。适宜的养分浓度下,幼苗可以健壮生长:养分浓度过高,会产生“烧苗”现象;过低则幼苗发育不良。一般来说,作物能够吸收利用的氮素形态有多种,但从营养学角度来看,NH4+和NO3-是植物根系直接吸收利用的主要氮源。已有研究表明,一定浓度下,NH4+可刺激侧根原基发育的起始,NO3-可促进侧根的伸长,NH4+和NO3-配合可诱导植物形成较大的根系。由此可见,植物根系的生长发育和形态的建成受到养分形态和供应浓度的调控。调节NH4+和NO3-的用量和配比可成为调控黄瓜育苗期内幼苗地上部和根系生长的重要途径。根际施 ...
【技术保护点】
1.一种黄瓜育苗控释复混肥,其特征在于:由如下重量份数的组分组成:包膜尿素10‑12份、硝酸铵磷2‑4份、磷肥3‑4份和钾肥3份;所述包膜尿素由尿素和包膜材料组成,所述包膜材料为聚氨酯,所述聚氨酯的重均分子量为30000‑100000,所述包膜尿素中N的质量百分含量为44%,初期溶出率大于0小于2%,养分释放期为40‑50天;所述硝酸铵磷中N的质量百分含量为30%‑32%,所述硝酸铵磷中P2O5的质量百分含量为4%‑6%。
【技术特征摘要】
1.一种黄瓜育苗控释复混肥,其特征在于:由如下重量份数的组分组成:包膜尿素10-12份、硝酸铵磷2-4份、磷肥3-4份和钾肥3份;所述包膜尿素由尿素和包膜材料组成,所述包膜材料为聚氨酯,所述聚氨酯的重均分子量为30000-100000,所述包膜尿素中N的质量百分含量为44%,初期溶出率大于0小于2%,养分释放期为40-50天;所述硝酸铵磷中N的质量百分含量为30%-32%,所述硝酸铵磷中P2O5的质量百分含量为4%-6%。2.根据权利要求1所述的一种黄瓜育苗控释复混肥,其特征在于,由如下重量份数的各组分组成:包膜尿素12份、硝酸铵磷2份、磷肥4份和钾肥3份。3.根据权利要求1所述的一种黄瓜育苗控释复混肥,其特征在于,所述磷肥为重过磷酸钙,所述磷肥中P2O5的质量百分含量为40%-44%;所述钾肥为硫酸钾,所述钾肥中K2O的质量百分含量为50%-52%。4.根据权利要求1所述的一种黄瓜育苗控释复混肥,其特征在于,所述包膜尿素、所述硝酸铵磷、所述磷肥和所述钾肥的颗粒直径均为3.0-4.0毫米。5.根据权利要求3所述的一种黄瓜育苗...
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