Effects of Integrated Organic and Inorganic Fertilizers on Yield and Growth Parameters of Rice Varieties

et al. 2020

Preprint

Background: Nutrient balance in rice paddy fields can change under different tillage management practices; however, the extent of the change may differ for various rice varieties. A field experiment was conducted over 2 successive years from June 2016 to June 2018 to clarify the effects of different tillage methods and rice varieties on nutrients remaining in the surface soil and those taken up by the rice. There were four tillage/rice variety treatments: no-till/japonica rice (NTJ), no-till/glutinous rice (NTG), conventional tillage/japonica rice (CTJ), and conventional tillage/glutinous rice (CTG) with three replicates of each.Results: The tillage method and rice variety had interactive effects on the surface balance of nitrogen (N) and phosphorus (P). After the 2-year experiment, total N and P pools in the 20 cm surface soil layer were highest under the NTJ treatment (4757.0 kg N ha-1, 2428.5 kg P ha-1) and lowest under the CTG treatments (4726.3 kg N ha-1, 2412.0 kg P ha-1). Under no-till conditions, japonica rice had higher grain yield but lower straw biomass than that of glutinous rice. NTG treatment significantly increased the N and P content in rice grains and straw. The environmental losses of N and P in the rice fields mainly occurred during the rice season. Based on nutrient balance estimation, N losses in the NTJ, NTG, and CTJ treatments were reduced by 15.03 kg N ha-1, 11.55 kg N ha-1, 6.72 kg N ha-1, respectively, as compared with that of the CTG treatment. The corresponding P losses were reduced by 8.02 kg P ha-1, 7.84 kg P ha-1, and 3.96 kg P ha-1. In terms of economic benefits, NTJ also resulted in the highest actual income (18896.5 yuan ha-1) and the highest ratio of production to investment (6.40).Conclusion: No-till was more likely to maintain soil N and P nutrients than conventional tillage, and this advantage was most significant when planting japonica rice. In addition, no-till was conducive to N and P uptake by rice, but only japonica rice exhibited increased grain yield. Consequently, the NTJ treatment was recommended.

Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 90%

Effects of no-till and rice varieties on nitrogen and phosphorus balance in rice fields

et al. 2020

Preprint

“…We found that both the grain yield and the growth rate of grain under the NTJ practice were highest. Our results are supported by the finding of previous studies [7,33,34]. In terms of nutrient uptake, the no-till practice improved the physical and chemical properties of paddy soil and effectively maintained soil nutrients, which was consistent with the nutrient demand of rice [34].…”

Section: Discussionsupporting

confidence: 91%

“…Although the positive effect on the yield of rice under notill condition was not significant in our study, the practice was deemed successful at maintaining a comparable or higher rice yield, as well as nutrients in the rice soil under certain conditions. Rice yield is closely related to factors such as grain number per panicle, 1000-grain weight, seed setting rate, and plant height [33,35]. The yield of rice grain for japonica rice was the highest among different treatments, while the biomass of straw grown with glutinous rice was the highest.…”

Section: Discussionmentioning

confidence: 99%

Effects of no-till and rice varieties on nitrogen and phosphorus balance in rice fields

et al. 2020

Environ Sci Eur

Background: Nutrient balance in rice paddy fields can change under different tillage management practices; however, the extent of the change may differ for various rice varieties. A field experiment was conducted over 2 successive years to clarify the effects of no-till and rice varieties on the apparent balance of nitrogen (N) and phosphorus (P). Four treatments: no-till/japonica rice (NTJ), no-till/glutinous rice (NTG), conventional tillage/japonica rice (CTJ), and conventional tillage/glutinous rice (CTG) with three replicates of each were established to test the hypothesis that no-till and japonica rice can improve the apparent balance of nutrients. Results: The tillage method and rice variety had interactive effects on the apparent balance of N and P. After the 2-year experiment, total N and P pools in the 20 cm surface soil layer were highest under the NTJ treatment (4757.0 kg N ha −1 , 2428.5 kg P ha −1) and lowest under the CTG treatments (4726.3 kg N ha −1 , 2412.0 kg P ha −1). Under no-till conditions, japonica rice had higher grain yield but lower straw biomass than that of glutinous rice. NTG treatment significantly increased the N and P content in rice grains and straw. The environmental losses of N and P in the rice fields mainly occurred during the rice season. Based on nutrient balance estimation, N losses in the NTJ, NTG, and CTJ treatments were reduced by 15.03 kg N ha −1 , 11.55 kg N ha −1 , 6.72 kg N ha −1 , respectively, as compared with that of the CTG treatment. The corresponding P losses were reduced by 8.02 kg P ha −1 , 7.84 kg P ha −1 , and 3.96 kg P ha −1. In terms of economic benefits, NTJ also resulted in the highest actual income (2724.25 US dollars) and the highest ratio of production investment (6.40). Conclusion: No-till was more likely to maintain soil N and P nutrients than conventional tillage, and this advantage was most significant when planting japonica rice. In addition, no-till was conducive to N and P uptake by rice, but only japonica rice exhibited increased grain yield. Consequently, the NTJ treatment was recommended to improve the N and P balance.

“…Rice yield is closely related to factors such as grain number per panicle, 1000-grain weight, seed setting rate, and plant height [33,35]. The yield of rice grain for japonica rice was the highest among different treatments, while the biomass of straw grown with glutinous rice was the highest.…”

Section: Discussionmentioning

confidence: 99%

Effects of no-till and rice varieties on nitrogen and phosphorus balance in rice fields

et al. 2020

Preprint

Background: Nutrient balance in rice paddy fields can change under different tillage management practices; however, the extent of the change may differ for various rice varieties . A field experiment was conducted over 2 successive years to clarify the effects of no-till and rice varieties on the apparent balance of nitrogen (N) and phosphorus (P). Four treatments: no-till/japonica rice (NTJ), no-till/glutinous rice (NTG), conventional tillage/japonica rice (CTJ), and conventional tillage/glutinous rice (CTG) with three replicates of each were established to test the hypothesis that no-till and japonica rice can improve the apparent balance of nutrients. Results: The tillage method and rice variety had interactive effects on the apparent balance of N and P. After the 2-year experiment, total N and P pools in the 20 cm surface soil layer were highest under the NTJ treatment (4757.0 kg N ha -1 , 2428.5 kg P ha -1 ) and lowest under the CTG treatments (4726.3 kg N ha -1 , 2412.0 kg P ha -1 ). Under no-till conditions, japonica rice had higher grain yield but lower straw biomass than that of glutinous rice. NTG treatment significantly increased the N and P content in rice grains and straw. The environmental losses of N and P in the rice fields mainly occurred during the rice season. Based on nutrient balance estimation, N losses in the NTJ, NTG, and CTJ treatments were reduced by 15.03 kg N ha -1 , 11.55 kg N ha -1 , 6.72 kg N ha -1 , respectively, as compared with that of the CTG treatment. The corresponding P losses were reduced by 8.02 kg P ha -1 , 7.84 kg P ha -1 , and 3.96 kg P ha -1 . In terms of economic benefits, NTJ also resulted in the highest actual income [2724.25 US dollars] and the highest ratio of production investment (6.40). Conclusion: No - till was more likely to maintain soil N and P nutrients than conventional tillage, and this advantage was most significant when planting japonica rice. In addition, no-till was conducive to N and P uptake by rice, but only japonica rice exhibited increased grain yield. Consequently, the NTJ treatment was recommended to improve the N and P balance.