Effects of Planting Densities on Radiation Resource Utilization of the Wheat Colony

doi:10.7668/hbnxb.2010.05.035

Abstract

Abstract: A field experiment was conducted to evaluate radiation resource utilization of colony in different planting densities of a winter wheat cultivar Shixin828. It was studied under four different density levels(210 × 104 (D1) , 270 × 104(D2) ,330 × 104 (D3) and 390 × 104 (D4) basis seedlings per ha) . The results indicated that the dsnsity could remarkably influence the radiation utilization. The D3 treatment had the rational size of colony and Leaf area index and had apparent advantages in Light distribution,coefficient and radiation use efficiency of total biological yield at late growth period,with the grain yield and radiation use efficiency of grain yield of it being higher than that of the others significantly. The D1 and D2 treatments had apparent advantages in light transmission rate and net assimilation rate,but it had less Leaf area and dry matter accumulation as a result of less colony; Leaf area index and photosynthetic potential of the D4 treatment was higher than that of the others significantly,but it had apparent disadvantages in net assimilation rate,extinction coefficient and radiation use efficiency of total biological yield at late growth period with close microclimate as a result of great colony; both above reducing yield and radiation use efficiency of grain yield. The winter wheat had the best Light distribution,assimilative capability and suitable dry matter accumulation, with nutriment transporting to grain and its radiation use efficiency of grain yield being up to 0. 572% ,by rational ap-plication of planting densities.

Key words: Wheat, Planting density, Radiation use efficiency, Grain yield

CLC Number:

S512.01

BI Changrui, BAI Zhiying, YANG He, LI Cundong, ZHENG Jinfeng, LI Dongxiao, TANG Guanglei. Effects of Planting Densities on Radiation Resource Utilization of the Wheat Colony[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2010, 25(5): 171-176. doi: 10.7668/hbnxb.2010.05.035.

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