The nitrogen uptake, yield and its components for two super-high-yielding hybrid rice combinations, Guodao 6 and Eryou 7954 were investigated under different plant densities (15, 18, and 21 plants/m2) and different nitrogen application rates (120, 150, 180, and 210 kg/hm2). The experiment was conducted on loam soil during 2004–2006 at the experimental farm of the China National Rice Research Institute in Hangzhou, China. In these years, the two hybrid rice clearly showed higher yield at a plant density of 15 plants/m2 with a nitrogen application rate of 180 kg/hm2. Guodao 6 produced an average grain yield of 10 215.6 kg/hm2 across the three years, while the yield of Eryou 7954 was 9 633.0 kg/hm2. With fewer plants per unit-area and larger plants in the plots, the two hybrid rice produced more panicles per plant in three years. The highest nitrogen uptake of the two hybrid rice was at a plant density of 15 plants/m2 with a nitrogen application rate of 180 kg/hm2. Further increasing nitrogen application rate was not advantageous for nitrogen uptake in super-high-yielding rice under the same plant density.
LIN Xian-qing, ZHU De-feng, CHEN Hui-zhe, ZHANG Yu-ping
. Effects of Plant Density and Nitrogen Application Rate on Grain Yield and Nitrogen Uptake of Super Hybrid Rice[J]. Rice Science, 2009
, 16(2)
: 138
-142
.
DOI: 10.1016/S1672-6308(08)60070-0
1 Liang Y M, Lin X Q, Sun Y F. Effects of different crop management on dry matter accumulation and plant type characteristics of rice (Oryza sativa L.). Acta Agric Zhejiang, 2006, 18: 82–85. (in Chinese with English abstract)
2 Bouman B A M, Tuong T P. Field water management to save water and increase its productivity in irrigated rice. Agric Water Manag, 2001, 49: 11–30.
3 Lin X Q, Zhou W J, Zhu D F, Zhang Y P. Effect of water management on photosynthetic rate and water use efficiency of leaves in paddy rice. Chinese J Rice Sci, 2004, 18(4): 333–338. (in Chinese with English abstract)
4 Lin X Q, Zhou W J, Zhu D F, Zhang Y P, Yang G H. Photosynthetic rate and water use efficiency of leaves at different positions at panicle initiation stage under the system of rice intensification (SRI). Chinese J Rice Sci, 2005, 19(2): 200–206. (in Chinese with English abstract)
5 Li X Q, Zhou W J, Zhu D F. The photosynthetic rate and water use efficiency of leaves at different position at panicle initiation stage under the system of rice intensification (SRI). Chinese J Rice Sci, 2005, 19(3): 200–206. (in Chinese with English abstract)
6 Lin X Q, Zhou W J, Zhu D F, Zhang Y P. Effect of SWD irrigation on photosynthesis and grain yield of rice (Oryza sativa L.). Field Crops Res, 2005, 94: 67–75.
7 Lin X Q，Zhou W J, Zhu D F, Chen H Z, Zhang Y P. Nitrogen accumulation, remobilization and partitioning in rice (Oryza sativa L.) under an improved irrigation practice. Field Crops Res, 2006, 96: 448–454.
8 Gravios K A, Helms R S. Path analysis of rice yield and yield components as affected by seeding rate. Agron J, 1992, 84: 1–4.
9 Counce P A, Moldenhauer K A K, Marx D B. Rice yield and plant yield variability responses to equidistant spacing. Crop Sci, 1989, 29: 175–179.
10 Counce P A, Wells B R. Rice plant population density effect on early-season nitrogen requirement. J Prod Agric, 1990, 3: 390–393.
11 Eagle A J, Bird J A, Horwath W R, Linquist B A, Brouder S M, Hill J E, van Kessel C. Rice yield and nitrogen utilization efficiency under alternative straw management practices. Agron J, 2000, 92: 1096–1103.
12 Slaton N A, Cartwright R D, Meng J, Gbur E E Jr, Norman R J. Sheath blight severity and rice yield as affected by nitrogen fertilizer rate: Application method and fungicide. Agron J, 2003, 95: 1489–1496.
13 Patrick W H, Mahapatra L C. Transformation and availability to rice of nitrogen and phosphorus in waterlogged soils. Adv Agron, 1968, 20: 323–359.
14 Broadbent F E. Mineralization of organic nitrogen in paddy soils. In: Nitrogen and Rice. Los Baños, Philippines: IRRI, 1979: 105–118.
15 Murayama N. The importance of nitrogen for rice production. In: Nitrogen and Rice. Los Baños, Philippines: IRRI, 1979: 5–23.
16 Hasegawa H. High-yielding rice cultivars perform best even at reduced nitrogen fertilizer rate. Crop Sci, 2003, 43: 921– 926.
17 IRRI. Program Report for 1993. Los Baños, Philippines: IRRI, 1994.
18 Toriyama K. Estimation of fertilizer nitrogen requirement for average rice yield in Japanese paddy fields. Soil Sci Plant Nutr, 2002, 48: 293–300.
