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• W4384377385 abstract "Little is known about the effects of intensification of cropping systems on the short-distance variability of total dry matter (TDM) yield of field crops in tropical cropping systems. To fill this knowledge gap, we used a factorial on-station experiment on a heavily weathered, tropical Nitisol in S-India consisting of a rainfed and an irrigated trial with low (N1), medium (N2), and high (N3) levels of mineral nitrogen (N) application. These fertiliser treatments were combined with a rotation of maize, finger millet, and lablab to investigate the development of TDM in two cropping cycles of three years each. Across six consecutive experimental years and for all crops our data show that at a total annual rainfall varying from 366 to 998 mm TDM yields in the irrigated field were higher than under rainfed conditions. Irrespective of the water regime, crop type, and N level, yields of maize (P < 0.0001) and millet (P < 0.0001) but not lablab significantly declined over time. The decline was stronger in irrigated than in rainfed crops and followed the sequence maize = finger millet > lablab. Log-transformed sample variance in grids of 1.2 × 1.2 m was higher in irrigated than in rainfed crops and variance declined stronger over time for both rainfed cereals in N1 plots without N followed by N2 and N3 plots. No N effects were noted in the legume lablab. When variances were standardised for TDM levels, we observed strongest growth of coefficients of variation over time in N1 plots of rainfed maize. Most differences in point estimates of trends were not significant at the 5% level due to relatively large standard errors. The results provide important insights for small-scale farmers and scientists in designing more efficient field experiments whose precision depends on plot size and number of replications." @default.
• W4384377385 created "2023-07-15" @default.
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• W4384377385 date "2023-10-01" @default.
• W4384377385 modified "2023-09-30" @default.
• W4384377385 title "Agricultural intensification effects on spatial growth variability of staple crops in south India" @default.
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• W4384377385 doi "https://doi.org/10.1016/j.fcr.2023.109032" @default.
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