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Theynlong Li, Zizhen Li and Theyide Li. 2004. Effect of the niche-fitness at different water supply and fertilization on yield of spring wheat in farmland of semi-arid areas. Agricultural Water Management, Volume 67, Issue 1, 1 June, Pages 1-13. Abstract. Strategies of regulated irrigation and fertilization of farmland in semi-arid regions of the Loess Plateau are analyzed in this paper. Theory and approach of niche-fitness are introduced into the research on field management of water use. Niche fitness of crop species describes the closeness degree between optimum niche point and actual resource state. Mathematical model is constructed to evaluate the adaptive extent of crop to different water–fertilizer conditions and the influence on yield. There are four water treatments in the research, in which rich water (RW), moderate water (MW) and low water (LW) indicate the irrigations of 520, 420 and 260 mm, respectively, while natural water (NW) the irrigation of precipitation (416.7 mm). Four treatments of fertilizers (i.e. high, moderate, low and non-fertilization) are disposed in RW, MW and LW while three types of plastic film coverings (i.e. 30, 60 days and non-cover) in NW. Field experiments with 15 dispositions repeated three times and there are 45 fields of 4m × 4m. Contrast to the result under LW, larger leaf area index (LAI) appear in RW, MW and NW, in which LAI of fertilization is even larger than that under non-fertilization, and the same result goes to the LAI influenced by plastic film covering. These results show that the value of niche-fitness and the yield of spring wheat will increase with the irrigation and the plastic film covering. The yield is significantly linear-correlated with niche-fitness. |
216 UCB