Light Interception And Photosynthesis Of Two Cultivars Maize Response To Three Planting Patterns

Planting patterns is an important factor affecting the maize canopy generation and thedistribution of light within the canopy. The canopy of the population structure, differentplanting patterns and genotype of crop will affect the canopy structure, intensity and extentof the light changes within the plant canopy, therefore induce the change within thestructure and physiological characteristics of leaves. In the current paper, the effects ofplanting patterns on the canopy structure, light interception, microclimate factor andphotosynthetic characteristics of two maize (Zea mays L.) cultivars (Beiyu288andXianyu335) were examined in three planting patterns, namely,(1) narrow–wide rows of"30+170"(P1,6.4plants m-2),(2)"40+90"(P2,6.4plants m-2), and (3) uniform row "65"(CK,6.4plants m-2). This study could improve maize cultivation theory, provide thetheoretical basis for the efficient production of maize..Experimental results show that:1, Light interception fraction (F) havs shown in the two genotypes, P1wassignificantly less than P2and CK. In the different planting patterns, before the formation ofthe canopy, the F value increased rapidly. In the early canopy closure, the lowest F value ofP1, the P2was Secondly, the CK is the highest. In128days after sowing, the F value beganto decline, in the different cropping patterns, P1, was still significantly lower than the othertwo patterns (LSD, p<0.05). Between P2and CK, there was not significantly different. Incontrast, we observed that the F value show a similar trend in Xianyu335.2, The difference of temperature among the crown of the three patterns is significant.P1was significantly greater than P2and CK, and P2was significantly greater than of CK;to the contrary the trend of relative humidity and temperature, expressed as P1<P2<CK;carbon dioxide concentration in the50cm height performed P1<CK <P2, and above50cmheight, CK was significantly higher than the P2and P1, and P2was significantly higherthan P1,50cm above the lower canopy temperature, carbon dioxide concentrations and lowrelative humidity, may cause certain inhibition in photosynthesis.3, The apparent quantum yield and net photosynthetic rate in the P1and P2aresignificantly higher than the control group; leaf value orientation in the P1is a constant,slightly lower P2compared with the control. The performance of the net photosyntheticrate (PN) and stomatal conductance (gs) and Ciwere better in a few.4, In three different planting patterns, the content of Ca and Mg of leaves at differentheight were signimicantly different, especially after the formation of canopy, during silkingstage and grainfilling stage, Ca in P1is significant higher than CK and P2, while Mg in P1and P2were significant higher than CK.5, Leaf area idex were not significantly different in two genotypes maize beforemaximum leaf area appears, the maximum leaf area index was measured at92days after sowing. The Xianyu335is closer to the ideal optimal leaf area index. Two differentgenotypes at50cm the LOV was decline with the increase of plant height. Which value inP1is significant lower than P2and CK. and no significant difference between P2and CK.The value of leaf angle in P1is higher than P2and CK, the simiar results were detected intwo genotype maize.6, in three different cultivation methods, radiation use efficiency in P2is significantlydifferent with CK. While no significant difference between P1and CK。...