Narrowing row spacing and adding inter-block promote the grain filling and flag leaf photosynthetic rate of wheat under enlarged drip tube spacing system.

Chlorophyll fluorescence parameters Under TR4, TR6, TR6L, and TR6S, with DAF, the actual photochemical efficiency of PSII (ΦPSII) and photochemical quenching coefficient (qp) of both NS22 and NS44 showed a trend to decline, and the decline was slow in the early period and sharp in the later period ( Figure 6 ).

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