作物学报 ›› 2017, Vol. 43 ›› Issue (05): 730-740.doi: 10.3724/SP.J.1006.2017.00730
魏海燕,李宏亮,程金秋,张洪程*,戴其根,霍中洋,许轲,郭保卫,胡雅杰,崔培媛
WEI Hai-Yan,LI Hong-Liang,CHENG Jin-Qiu,ZHANG Hong-Cheng*,DAI Qi-Gen,HUO Zhong-Yang,XU Ke,GUO Bao-Wei,HU Ya-Jie,CUI Pei-Yuan
摘要:
以大穗型品种甬优2640和多穗型品种南粳9108为材料, 270 kg hm-2纯氮条件下,选用树脂包衣(PCU)、硫包衣(SCU)和脲甲醛(UF)3种缓控释肥类型,设置了缓控释肥与尿素均基施、缓控释肥基施后分蘖期施尿素2种施肥方式,以常规尿素定量分施为对照(CK)。结果表明,缓控释肥的应用对甬优2640无增产效应。主要因为甬优2640穗大粒多,群体颖花量大。与CK比,相对集中在前中期的肥效难以满足植株全生育期生长,中后期叶面积指数下降快,氮素积累少,光合势弱,物质生产量不足,不能实现群体大库容的有效充实。而对南粳9108,脲甲醛基施+尿素分蘖期施处理比CK增产5.2%~5.9%,树脂包衣基施+尿素分蘖期施和脲甲醛+尿素均基施处理与CK平产的同时可减少施肥2~3次。2种运筹方式中,以缓控释肥基施后分蘖期施用尿素处理能有效增加植株茎蘖数,提高成穗率和最终穗数,扩大叶面积指数,增强光合势,增加干物质和氮素的积累,获得高产。3种肥料类型中,产量呈现UF> PCU >SCU。脲甲醛基施+分蘖期施尿素处理之所以能使南粳9108获得比CK更高的产量,是因为UF的肥效在中后期依然能相对稳定释放,配合尿素的分蘖期施用,既保证了前期分蘖的发生,又能保证高峰苗后稳定的茎蘖数和群体叶面积指数,植株在拔节后的光合势和物质积累量大,氮肥利用率高,增产显著。由此可见,针对不同穗型和产量特性的水稻品种,优选缓控释肥类型基施的同时,分蘖期配合速效肥料的施用,可获得既省工又增产的效果。
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