Yield and Soil Fertility Trends in a 20‐Year Rice–Rice–Wheat Experiment in Nepal

Regmi, A. P.; Ladha, J. K.; Pathak, Himanshu; Pasuquin, Estela Magbujos; Bueno, Crisanta Sunio; Dawe, D.; Hobbs, Peter; Joshy, D.; Maskey, S. L.; Pandey, Suprabha

doi:10.2136/sssaj2002.8570

Cited by 122 publications

(75 citation statements)

References 27 publications

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“…Compared with the control, all fertilization treatments had no significant effects on soil pH and SOC contents (P > 0.05), but generally increased nutrients content when corresponding elements were applied (Table 2). These findings are in agreement with the results of Regmi et al (2002) and Zhang et al (2009), who reported that the contents of N, P and K were increased when compared with those of no fertilizer control. Furthermore, soil bulk densities (SBD) in NPK and 2NPK treatment were significantly lower than those in control and N (P < 0.05).…”

Section: Resultssupporting

confidence: 93%

“…Generally, rice yield in the longterm experiments remained stable when recommended doses of N, P and K were applied , Ladha et al 2003). Where yield declines occurred, the major causes were attributable to inappropriate fertilizer managements , Ladha et al 2003, prolonged soil wetness , delay in sowing (Regmi et al 2002), and increased nighttime temperature associated with global warming (Peng et al 2004).…”

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confidence: 99%

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Effects of long-term chemical fertilization on trends of rice yield and nutrient use efficiency under double rice cultivation in subtropical China

Juanjuan

Liu

et al. 2014

PLANT SOIL ENVIRON

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A long-term (33 years) experiments were conducted to investigate the effect of chemical fertilization on rice yield, yield trends, soil properties, agronomic efficiency of applied nutrients and nutrient balance for the double rice cropping systems in subtropical China. The treatments were different combinations of N, P and K fertilizers (N, NP, NK and NPK), double dose of recommended NPK (2NPK) and no fertilizer control (control). Compared with no fertilizer control, all fertilization treatments had no significant effects on soil pH and SOC contents (P > 0.05), but generally increased nutrients content when corresponding elements were applied. The impact of fertilizers on grain yields was 2NPK > NPK > NP > NK > N, and application of P fertilizer not only increased the rice yield, but improved yield stability. The trend of agronomic use efficiency of applied P was significantly positive (P < 0.05) only for the first rice crop, suggesting that P fertilizer played a less important role in the second rice season than in the first rice season. The study indicated that the current local fertilizer recommendations should be optimized for the consideration of differences in indigenous nutrient supplies in different rice seasons.

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Section: Resultssupporting

confidence: 93%

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confidence: 99%

Effects of long-term chemical fertilization on trends of rice yield and nutrient use efficiency under double rice cultivation in subtropical China

Juanjuan

Liu

et al. 2014

PLANT SOIL ENVIRON

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“…Hobbs and Morris (1996) observed a 1% decrease for each day that wheat sowing was postponed after the optimum sowing date (15)(16)(17)(18)(19)(20) November). Regmi et al (2002) also reported a yield decline in wheat when it was sown after the third week of November. A major reason for late sowing is the late harvest of the preceding crops.…”

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confidence: 97%

Performance of Late Sown Wheat in Response to Foliar Application of Moringa oleifera Lam. Leaf Extract

Yasmeen

Basra

Ahmad

et al. 2012

Chilean J. Agric. Res.

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A rise in temperature during early spring inducing early maturity is a key yield-reducing factor in late sown wheat (Triticum aestivum L.). Moringa oleifera Lam. leaves are rich in zeatin, a cytokinin that plays a role in delaying leaf senescence, in addition to other growth-enhancing compounds such as ascorbates, phenolics, and minerals. The objective of this study was to optimize dose and optimum growth stage for foliar-applied moringa leaf extract (MLE) and its role in delaying leaf senescence in late sown wheat. The wheat crop was sown on 16 December 2008; MLE (diluted 30 times) was applied at different growth stages from tillering to heading and heading alone and distilled water was sprayed as a control. All the MLE treatment results were better than the control. However, an increase of 10.73%, 6.00%, 10.70%, and 4.00% was evident in 1000 grain weight, biological yield, grain yield, and harvest index, respectively, with MLE spray at tillering + jointing + booting + heading. The MLE spray used only at heading gave 6.84%, 3.17%, 6.80%, and 3.51% more than the control 1000 grain weight, biological yield, grain yield, and harvest index, respectively. The MLE extended seasonal leaf area duration (Seasonal LAD) by 9.22 and 6.45 d over the control when applied at all growth stages and a single spray at heading, respectively. We conclude that it is possible that the presence of growth-promoting substances in MLE foliar spray can delay crop maturity and extend seasonal LAD and the grain-filling period, thereby leading to greater seed and biological yields in late sown wheat.

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“…Several other scientists (Zia et al, 2007;Singh and Tripathi, 2008;Reddy et al, 2010) reported the results in conformity with the results of present study. Regmi et al, (2003) also found consistently higher yield of rice in the NPK treatments than in treatments where one or more nutrients were lacking in case of a 20-years experiment. Further, 100% NPK + 5 Kg/ha Zn (along with S @ 40 kg/ha) in case of rice was reported to be best for the farmers so far as grain yield, straw yield and nutrient uptake values are concerned (Trivedi et al, 2015).…”

Section: Resultsmentioning

confidence: 57%

Soil fertility and on-farm crop response to NPK and Zn fertilization in rice-rice cropping sequence of Lower Brahmaputra Valley Zone of Assam

Baishya

Gogoi

Bora

et al. 2017

ASD

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Despite being a major source of livelihood, rice cultivation in the plains of the north-east region of India is under stress due to depletion of native nutrient reserves, emergence of multi-nutrient deficiencies and consequent decline in factor productivity of applied nutrients. With the aim to enhance productivity and to develop efficient fertilizer management strategies for the region, the authors discuss the status of post harvest soil properties and on-farm crop response to plant nutrients in rice-rice sequence under the climatic situation of Lower Brahmaputra Valley Zone of Assam. Results revealed that the recommended dose of NPK fertilizers along with 5 Kg ZnSO 4 application not only increases the yield of rice-rice sequence but also enhances the post harvest fertility status of soil.

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Yield and Soil Fertility Trends in a 20‐Year Rice–Rice–Wheat Experiment in Nepal

Abstract: Declining yields and soil nutrient balance in a long-term rice-rice-wheat study suggest depletion of soil potassium (K) and inadequate K fertilization seem to be primary reasons for limited and declining crop yields.

Cited by 122 publications

References 27 publications

Effects of long-term chemical fertilization on trends of rice yield and nutrient use efficiency under double rice cultivation in subtropical China

Effects of long-term chemical fertilization on trends of rice yield and nutrient use efficiency under double rice cultivation in subtropical China

Performance of Late Sown Wheat in Response to Foliar Application of Moringa oleifera Lam. Leaf Extract

Soil fertility and on-farm crop response to NPK and Zn fertilization in rice-rice cropping sequence of Lower Brahmaputra Valley Zone of Assam

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