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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