不同基追比施磷对滴灌稻田土壤无机磷组分及水稻产量的影响

Effects of different ratios of base P to dressing P on inorganic phosphorus fractions in paddy soil and rice yield

为寻求滴灌水稻最适磷肥基追比方案,设计不同基追比处理(CK:无磷肥,T1:全基,T2:30%基+70%滴,T3:70%基+30%滴,T4:全滴),采用土壤分层取样、生育时期干物质测定和收获后考种的方法 ,研究不同基追比对滴灌稻田土壤无机磷组分及水稻产量构成的影响。结果表明:在收获期,较其他处理,T1处理的Resin-P、Na HCO3-P含量最高,HCl-P含量最低;T2处理的残渣-P含量最高,Na OH-P含量最低;T3、T4处理的无机磷各组分含量互有高低。30%基施、70%追施的施磷模式在同等条件下可以获得最大生物量及产量,分别比对照增产11.67%、9.92%,类似趋势还表现在有效穗数、穗粒数、实粒数、结实率及千粒重上。

To seek for the optimal ratio of base P to dressing P for drip irrigation rice, different ratios of base P to dressing P were designed, including CK： no phosphatic fertilizer, TI： 100%, T2： 30% base P ＋ 70% dressing P, T3： 70% base P＋30% dressing P, T4： 100% dressing P, the impacts of different ratios of base P to dressing P on soil inorganic phosphorus components and rice yield components were studied by adopting soil stratification sampling, dry matter determination at growth stage and test species after harvest. The results showed that the contents of Resin-P, NaHCO3-P of T1 treatment were the highest, HC1-P of which was the lowest compared with other treatments in the harvest period. Residue-P content of T2 treatment was the highest, NaOH-P content of which was the lowest. Inorganic phosphorus content of each component of T3 and T4 treatment had no regular pattern. The mode of 30% basal application and 70% topdressing of phosphorus could obtain the highest biomass and yield, increasing by 11.67% and 9.92% respectively, compared to CK. There was a similar trend reflecting in the effective panicles, grain number, real grain number, seed rate and grain weight on.