Effects of NPK Fertilizer Combinations on Yield and Nitrogen Balance in Sorghum or Pigeonpea on a Vertisol in the Semi-Arid Tropics
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概要
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A long-term experiment was carried out on a Vertisol from 1986 to 1992 to examine the combined effects of NPK fertilizers on yield using sorghum (Sorghum bicolor L. Moench cv. CSH 5) and short-duration pigeonpea (Cajanus cajan L. Millsp. cv. ICPL 87). The fertilizer treatments were as follows: 0 (no fertilization), N (150 kg N ha^<-1>), P (65.5 kg P_2O_5 ha^<-1>), K (124.5 kg K_2O ha^<-1>), and all possible combinations (NP, NK, PK, and NPK). In this study we continued this experiment during the period 1993 to 1994 and analyzed the crop yield response to fertilizers and the N balance. The amount of N derived from the atmosphere and fertilizer was estimated by the ^<15>N natural abundance method and ^<15>N isotope dilution method, respectively. A combined application of N and P fertilizers gave the highest grain yield for the two crops under the 8th and 9th continuous croppings, unlike the application of K fertilizer. The values of total N for the two crops were significantly higher in the NP and NPK plots. These crops took up N mainly from soil. There was a significant positive relationship between the uptake of N_<dff> and N_<dfs> by each crop. Pigeonpea or sorghum took up more N from the soil in the N fertilizer plots than in the plots without N, suggesting that soil N fertility was enhanced and the amount of N supplied from soil increased in the plots with consecutive application of N fertilizer for 7 y. Even pigeonpea, which fixes atmospheric N inherently, needed N fertilizer to achieve high grain yield, suggesting that N fixation by the nodules was not always sufficient to meet the N requirements of the crop under these conditions. Although fertilizer N exerted a beneficial effect on plant growth and yield in the two crops, the values of fertilizer N recovery (FNR) by the two crops were considerably low. Therefore, it is suggested that the development of N fertilizer management which could maximize FNR of each crop should be promoted.
- 社団法人日本土壌肥料学会の論文
著者
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Dacanay E
Bureau Of Soils And Water Management Quezon City Phl
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Rao Theertham
International Crop Research Institute For The Semi-arid Tropics (icrisat) Asia Center
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Rao Theertham
International Crops Research Institute For The Semi-arid Tropics (icrisat)
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Ito O
Miyagi Prefectural Furukawa Agricultural Experiment Station Furukawa Jpn
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DACANAY Esperanza
Soil Research Development Center, The Philippines
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Yoneyama Tadakatsu
National Agriculture Research Center
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Adu-gyamfi Joseph
International Crops Research Institute For The Semi-arid Tropics (icrisat)
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Yoneyama Tadakatsu
National Agricultural Research Center For Tohoku Region
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Dacanay Esperanza
Soil Research Development Center The Philippines
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Katayama K
International Crops Research Institute For The Semi-arid Tropics (icrisat):(present Addresses)nation
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Katayama Katsuyuki
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)
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Ito Osamu
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)
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Ito Osamu
International Crop Research Institute For The Semi-arid Tropics (icrisat) Asia Center:(present Addre
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Dacanay Esperanza
Soil Research and Development Center, Bureau of Soils and Water Management, Department of Agriculture
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