| The temporal and spatial changes of soil water potentials with different treatments and the effects of the treatments of different soil water potentials on LAIs, leaf chlorophyll contents, circumferences and dry matter accumulation of radish were studied; The yields and water use efficiency with different treatments were compared. The results showed that in planting radish in the frequently-raining second half of a year, (1) the treatments of different soil water potentials did not significantly affect radish growth; (2) the treatments of different soil water potentials had different water use efficiencies which could be ranked in the order of N5＞N4＞N3＞N2＞N1 from high to low, and (3) the weights per radish and yields with the treatments of different soil water potentials under drip irrigation were higher than those in surface irrigation. |