Crops ›› 2017, Vol. 33 ›› Issue (3): 91-95.doi: 10.16035/j.issn.1001-7283.2017.03.017

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Effects of Different Application Rate of Potassium Fertilizer on the Yield and Agronomic Traits of Longshu 28

Chen Genhui,Guo Qimao,Lin Zilong,Huang Yanxia,Yang Liming   

  1. Agricultural Research Institute of Longyan City,Longyan 364000,Fujian,China
  • Received:2017-02-08 Revised:2017-03-23 Online:2017-06-15 Published:2018-08-26

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Abstract:

The effects of different potassium(K) fertilizer application rate (0, 75, 150, 225, 300, 375kg/hm 2) on the yield and agronomic traits of Longshu 28 were studied by a single factor randomized block design.The results showed that the stem diameter was determined by the variety characteristics.The appropriate amount of K fertilizer used significantly increased the number of branches, stem length, stem weight, tuberous root weight per plant, and large- andmedium-sized tuberous root rate. Application of K fertilizer could promote the growth of sweet potato tuberous root rate dry matter accumulation, increase tuberous root rate dry matter content. The contribution rate of low K level on tuberous root rate dry matter is higher than that of high K. Longshu 28 is an anti-aging variety. The K fertilizer could improve the velocity peak during transplanting (90-120d) and it reduced the value of T/R. Under the condition of available K (118.6mg/kg) in soil with N at 120kg/hm 2, P2O5 at 75kg/hm 2, K2O at 300kg/hm 2, Longshu 28 could reach the maximum fresh tuberous root yield of 40 416.94kg/hm 2, dry tuberous root yield at 13 479.05kg/hm 2, starch yield of 9 154.55kg/hm 2 and the economic benefit of 79 113.88 yuan/hm 2.

Key words: Sweet potato, Potassium fertilizer, Yield, Agronomic traits, Longshu 28

Table 1

The difference of agronomic characters of Longshu 28 with different treatments (135d after planting)"

处理
Treatment		 蔓长(cm)
Stem
length		 单株分枝数(个)
Average number of base branch		 茎粗(cm)
Stem
diameter		 单株蔓重(kg/株)
Stem weight
per plant		 单株薯重(kg/株)
Fresh tuberous root weight per plant		 大中薯率(%)
Portion of large-and medium-sized tuberous root		 薯块干物率(%)
Tuberous root dry matter rate		 蔓重/薯重
T/R
T0(CK) 175bB 8.3cB 0.62aA 0.70cB 1.17dD 85.04cB 33.21dD 0.63bAB
T1 174bB 9.3bAB 0.63aA 0.75bcAB 1.22cdCD 91.61abA 33.90aA 0.62bcAB
T2 182aA 11.3abAB 0.62aA 0.78abAB 1.27cC 90.91abA 33.83aA 0.62bcAB
T3 184aA 12.0aA 0.61aA 0.79abAB 1.37bB 93.90aA 33.49bB 0.58cdBC
T4 175bB 11.0abAB 0.61aA 0.83aA 1.50aA 91.57abA 33.35cC 0.55dC
T5 169cC 10.3abAB 0.62aA 0.70cB 1.03eE 91.61abA 33.52bB 0.68aA

Table 2

Effects of different K fertilizers rate on the yield of Longshu 28 kg/hm2"

处理
Treatment		 鲜薯
Fresh tuberous root		 薯干
Tuberous root dry matter		 淀粉
Starch		 生物量
Biomass
T0(CK) 31 666.76eD 10 516.53eD 7 134.07eD 17 131.70eE
T1 34 161.83dC 11 580.86dC 7 901.11dC 18 668.56dD
T2 35 784.67cC 12 105.95cBC 8 254.67cC 19 508.65cC
T3 37 891.19bB 12 689.76bB 8 628.59bB 20 171.22bB
T4 40 416.94aA 13 479.05aA 9 154.55aA 21 275.53aA
T5 34 803.21cdC 11 666.04dC 7 934.47dC 18 281.23dD

Fig.1

Effects of different treatments on increasing rate of tuberous root"

Fig.2

Effects of different treatments on tuberous root dry matter rate"

Fig.3

Effects of different treatments on T/R"

Table 3

Economic benefit analysis of K fertilizer application"

处理
Treatment		 鲜薯产量(kg/hm2)
Fresh tuberous root yield		 肥料成本(元/hm2)
The cost of fertilizer		 鲜薯产值(元/hm2)
The value of fresh tuberous root		 增加产值 Increase the value
(元/hm2) (%)
T0(CK) 31 666.76 820 62 513.52 - -
T1 34 161.83 1 045 67 278.67 4 765.15 15.45
T2 35 784.67 1 270 70 299.33 7 785.81 25.24
T3 37 891.19 1 495 74 287.38 11 773.86 38.17
T4 40 416.94 1 720 79 113.88 16 600.36 53.82
T5 34 803.21 1 945 67 661.42 5 147.90 16.69
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