QUANTITATIVE GENETIC ANALYSIS OF SEEDLING ROOT CHARACTERS IN RICE Responses of nitrogen supply forms on leaf photosynthetic characteristics and root characters of sweetpotato Genetic Analysis of Root Characters in Recombination Inbred Lines(RIL) of Peanut(Arachis hypogaea L.) Relationship between vertical distribution of fine root in different successional stages of herbaceous vegetation and soil environment in Loess Plateau