The Effects of Different N and K Fertilizer Ratio and Planting Density on Yield and Dry Matter Accumulation of Sweetpotato

doi:10.3969/j.issn.1000-7091.2012.z1.063

Abstract

Abstract: A field experiment was conducted to study the effects and their interaction of different planting density and N， K fertilizer application amount on yield and dry matter accumulation of sweetpotato Sushu 15． The resultsshow that dry matter accumulation and economic yield are significantly impacted by different amount of N， K andplanting density and their interaction． Yields of dry matter had significant positive correlation with dry matter content， or number of base branches， and had extremely significant negative correlation with the rate of top and root， andhad significant negative correlation with stem diameter． Dry matter content of storage roots had negative correlationwith length of the longest vine， number of base branches， and had significant negative correlation with stem diameter． In 18 experiment treatments， the highly economic yield appeared in treatment of A1 B1 C1 ， and had the optimalrate of top and root． The effect of each factor on dry matter accumulation of storage roots was K fertilizer ＞ plantingdensity ＞ N fertilizer， K fertilizer and planting density had significantly interaction effect; N fertilizer and planting density were mostly influence factor on dry matter accumulation of stems and leaves． Therefore， the basic conditions of obtained high yield were to maintain a reasonable planting density in sweetpotato production， it was unlikely to achievesuper-high yield by increase planting density． Under the experiment condition， the combination of N 120 kg /ha² K₂O180 kg /ha and 4． 95 × 10⁴ plant /ha is favorable for high economic yield of Sushu 15．

Key words: Sweetpotato, N and K fertilizer ratio, Transplanting density, Dry matter accumulation, Yield

CLC Number:

S531

JIA Zhao-dong, MA Pei-yong, BIAN Xiao-feng, GUO Xiao-ding, XIE Yi-zhi. The Effects of Different N and K Fertilizer Ratio and Planting Density on Yield and Dry Matter Accumulation of Sweetpotato[J]. ACTA AGRICULTURAE BOREALI-SINICA, doi: 10.3969/j.issn.1000-7091.2012.z1.063.

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