Table 2 Linear technological trend equations for rice productivity and regression statistics (R ² and SE) in the three studied agroecosystems

Rice—aus

TRPt _i  = 1.7462 + 0.0588t _i

(R ² = 0.77*; SE = 0.0722)

TRPt _i  = 1.8592 + 0.0501t _i

(R ² = 0.82*; SE = 0.0596)

TRPt _i  = 2.145 + 0.0308t _i

(R ² = 0.52*; SE = 0.046)

Rice—aman

TRPt _i  = 1.7826 + 0.0847t _i

(R ² = 0.76*; SE = 0.1022)

TRPt _i  = 1.7646 + 0.0859t _i

(R ² = 0.89*; SE = 0.0982)

TRPt _i  = 2.1369 + 0.0577t _i

(R ² = 0.66*; SE = 0.0755)

Rice—boro

TRPt _i  = 3.111 + 0.0816t _i

(R ² = 0.65*; SE = 0.109)

TRPt _i  = 3.0815 + 0.0662t _i

(R ² = 0.87*; SE = 0.0768)

TRPt _i  = 3.3319 + 0.0527t _i

(R ² = 0.45*; SE = 0.0844)