Study Of Root Lodging Characteristics And Potassium Regulations Of No-tillage Cast-transplanting Rice

The effects of different planting methods and K levels on root lodging characteristics,dynamics of population development, accumulation and distribution of dry matter,accumulation and translocation of K, grain yield and its components of rice were studiedby taking hybrid rice D you 527 as materials. Meanwhile, the effect of K on root lodgingresistance of no-tillage cast-transplanting rice was studied. The main results were asfollows:1. The correlative coefficient between W and RLC, H and RLC were the most and theleast, respectively; the correlative coefficient between M and RLC was close to between Gand RLC. Moreover, the correlative coefficients between G and RV, M and DS, M andDSS, M and PBS, M and KC, G and FSW, G and FLW were significant at 0.05 or 0.01levels. The root lodging coefficient (RLC) of CTTR, NTSCTR, NTCTR and CTCTR were2.72-5.82, 2.54-5.68, 2.32-5.39 and 2.42-5.15, respectively, which means the root lodgingresistance of CTTR was the least, the root lodging resistance of NTSCTR was less thanthat of CTCTR and NTCTR, and the root lodging resistance of CTCTR was as much asthat of NTCTR. The RLC of no-tillage cast-transplanting rice was decreased along with Kincreased, and the differences of RLC among different K treatments were significant at0.05 or 0.01 levels respectively. It could boost the development of NTCTR root (includingincreasing W and RV and boosting root to distribute in the soil that the radii was 5-10cm)to enhance rice fixing force, could reduce G, FSW and FLW to decrease personal weight tocause lodging, could increase DS, DSS, PBS and KC to improve the quality of haulm byusing K.2. The tillering speed, number of tillers and durative time for producing effectivetillers of CTTR were less than that of cast-transplanting rice. The tillering ability ofCTCTR was less than that of NTCTR, and the tillering ability of NTCTR was less thanthat of NTSCTR. It could boost the development of tillers, protract the durative time forproducing effective tillers and increase LAI by using K. The effects of different planting methods and K levels on SPAD were different in different growth stages.3. The dry matter weight (DMW) of NTCTR and CTTR were bigger than the othersin different growth stages, the DMW of CTCTR were less than that of NTSCTR from JS toHS, but the former were bigger than the latter in TS and MS. The effect of different Klevels on DMW wasn't significant at 0.05 levels, and the DMW of B1, B2, B3 and B4were different in different growth stages.4. Although the EP of CTTR was the least, the grain yield (GY) of CTTR was10.71×10³ kg·hm^-2 because of high NSPP and NGPP, which increased by 3.62%, 1.58% and1.88% to CTCTR, NTCTR and NTSCTR respectively. The GY of NTCTR was higher thanthat of NTSCTR and CTCTR because of high NSPP and KGW. It could increase thenumber of NSPP, NGPP and GY, but decrease SSR and PTP by using K. Furthermore, thecorrelative coefficient between GY and K was significant at 0.05 levels.5. The TKA of CTTR was 278.87kg·hm^-2, which increased by 6.34%, 4.40% and10.42% to CTCTR, NTCTR and NTSCTR respectively, and the differences weresignificant at 0.01 levels. The change of KDMPE, KGPE and KHI in four plantingmethods were NTSCTR＞CTCTR＞NTCTR＞CTTR. The KAE of NTCTR was the biggest.TKA increased, KDMPE, KGPE and KHI decreased with K increased, but KAE wasn'tinfluenced by using K.