Effect of nitrogen-potassium interaction on absorption and translocation of nitrogen and potassium in sweetpotato and the root yield
A field experiment was conducted at agricultural experiment station of Shandong Agricultural Uni-versity, Tai'an, Shandong Province in 2013–2014. Split plot design with two factors, three nitrogen (N) levels and three potassium (K) levels. Selected material of the 'Ji Xu 23', starch sweetpotato variety, to study N-K in-teraction on absorption, transfer and distribution of N/K in sweetpotato and its relationship with storage root yield. The results show that the best amount of K fertilizer was 180 kg·hm-2 when without N fertilizer and its N/K use efficiency was the highest, higher storage root yield. When the amount of N applied was 90 kg·hm-2, if the shoots of N/K transport rate, roots distribution rate and storage root yield were the highest, the amount of K fertilizer should be at least 360 kg·hm-2. Under appropriate N application, the key of high yield of sweetpotato could promote the shoot N/K to root transfer, improve the rate of distribution in root at harvest.
sweetpotatonitrogen-potassiumabsorptiontransfer and distributionyield
NETL
NSTL
万方数据
维普
