Effects of Different Mulching Treatments and Row Spacing Interactions on Photosynthetic Characteristics and Yield of Setariai talica
In order to study the effects of mulching treatments and row spacing on the photosynthetic characteristics and yield of Setariai talica,three types of mulching methods(A1:full mulching;A2:inter-membrane;A3:no mulching)were set up to intercropping cultivation with two levels of row spacing(equal spacing 50 cm,wide and narrow rows 60140 cm),and no mulching was taken as the control,with a total of 7 treatments set up,including A1B1(T1),A1B2(T2),A2B1(T3),A2B2-1(T4),A2B2-2(T5),A3B1(CK1),and A3B2(CK2),using the Jin Grain No.21 as the test material.The results showed that both mulching methods could improve the photo-synthetic capacity and yield of S.talica compared with the control.Among them,A2B1(T3)treatment had the high-est net photosynthetic rate,stomatal conductance and intercellular CO2 concentration,which were 23.38 μmol·m-2·s-1,0.17 mol H2O·m2·s,and 133.07 μmol·mol-1,respectively,and A1B2(T2)treatment had the lowest transpiration rate,which was 2.82 mmol·m-2·s-1,and was higher than A3B2(CK2)by 19.20％.The A2B1(T3)treatment had the highest single spike weight and yield,29.25 g and 5 793.25 kg/hm2,respectively,which were significantly higher than the other treatments.In summary,A2B1(T3)treatment,which can signifi-cantly enhance S.talica photosynthesis,improve yield,and obtain higher economic benefits,can be used as an im-portant cultivation measure in grain production in Yulin.
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