|Author:||Zhang, ZhiShan ; Li, XinRong ; Zhang, PeiDong ; Zhang,JingGuang ; Wang, XinPing ; Liu, LiChao|
|Book Group Author:||NA|
A field experiment was conducted to investigate the effect of supplementary irrigation on watermelon (Citrullus lanatus) yield, water-use efficiency (WUE) and root distribution in gravel-mulched field in northwest Loess Plateau (Gansu, China) during 2001 and 2002 growing seasons. The gravel mulch significantly improved seedling emergence, increased yield and WUE, and alleviated the influence of drought on plant growth. Regardless of gravel mulch application, supplementary irrigation increased watermelon yields, average fruit weight and number of fruits, especially yield increased as the amount of irrigation increased (P<0.05). Generally, the WUE of irrigated treatments were higher than that of non-irrigation treatment in gravel-mulched field. The effect of water supply on root distribution was different in the two years. In 2001, average root length density (RLD) and root weight density (RWD) along the soil profile increased. In 2002, however, RLD and RWD decreased as water supply increased. The average RLD and RWD in 2001 were significantly higher than those in 2002. Maybe we can interpret the phenomenon with the theory that there is a need to optimize root distribution (in terms of water relations) and aboveground biomass for a given water supply. The yield may not depend as much on root growth as on the amount of water required at critical stages. A significant effect of soil depth on RLD and RWD was observed in both years, but did not rapidly decrease with depth.
|Pages:||914 - 922|
|Journal:||Agricultural Sciences in China|
crop yield, drought, fruits, gravel, growth, irrigation,mulches, mulching, plant water relations, roots, seedling emergence,soil depth, water supply, water use efficiency, watermelons, yieldcomponents, China, Gansu, Citrullus lanatus, Citrullus, Cucurbitaceae,Violales, dicotyledons, angiosperms, Spermatophyta, plants, eukaryotes,East Asia, Asia, Developing Countries, North Western China, China,Kansu, mulching materials, water supplies, watering, Horticultural Crops(FF003) (New March 2000), Plant Water Relations (FF062), PlantProduction (FF100), Soil Water Management (Irrigation and Drainage)(JJ800) (Revised June 2002) [formerly Soil Water Management], SoilManagement (JJ900)