“苏香粳100”由于成熟期偏迟,抗倒性一般,在江苏省无锡市的种植面积不大.为此,特对“苏香粳100”早熟抗倒栽培技术进行了研究.结果 表明:“苏香粳100”在无锡市种植,每667 m2产量要达到600 kg,需每667 m2有效穗数在20万穗以上、每穗总粒数在120粒左右、结实率在95％左右、千粒重在28 9以上;同时,搁田达标处理比搁田不达标处理的植株基部第一、第二节间明显粗、短,抗倒性增强;此外,在总施氮量相同的前提下,后期氮肥施用量比例高处理比后期氮肥用量比例低处理的熟期早、产量高、抗倒性好.

为探索“武运粳23号”机插稻超高产技术策略,实施了不同栽插密度等多项栽培试验和农情调查,最终形成了“足穗打基础,主攻壮秆大穗挖潜力”的栽培策略,并配套了“抓壮秧早栽,前期足肥早施,中期控水补钾,后期肥保水养”的栽培技术.

With the development of agriculture,more and more nitrogen and phosphorus fertilizer were supplied in field rice growth in China.But in the mass,kalium(K) was absent in many areas.Hyacinth could absorb large quantities of kalium and concentrate them in their tissues.In this study,the field experiment was conducted to investigate the effects of hyacinth mulching on rice kalium concentration,uptake,efficiency and allocation at different growth stages.Took ' Yun 2645 ' as material,the kalium uptake and utilization of rice were evaluated under two different levels of N input:low(LN,120 kg/hm 2) and normal N(NN,240 kg/hm 2) in 2009.The results showed that:(1) Compared with AMB,hyacinth mulching significantly increased K concentration in rice plant over the season,and the increasing rate was gradual decline from mid-tillering to heading,but from heading to maturity the increasing rate was gradual addition,hyacinth mulching significantly increased Kalium accumulation in rice plant.(2) Hyacinth mulching had no obvious effect on Kalium allocation pattern in leaves and stems of rice over the season,significantly decreased kalium allocation pattern in spikes at grain maturity.(3) Hyacinth mulching resulted in the significant decrease in K use efficiency for biomass(KUEp) over the season,K use efficiency for grain yield(KUEg) and K harvest index(KHI) decreased under hyacinth mulching.(4) Kalium concentration and accumulation at different growth stages of rice increased with increasing N supply(P<0.01),but KUEp and KUEg showed the opposite trends.(5) Interactions between hyacinth mulching × N were not observed for K uptake and utilization.Hyacinth mulching increased K concentration and K uptake,decreased KUEp and KUEg at different growth stages of rice.