Effect of panicle nitrogen on grain filling characteristics of high-yielding rice cultivars

Jiang, Qi; Du, Yanxiu; Xiao-ya, Tian; Qiangsheng, Wang; Xiong, Ruiheng; Xu, Guochun; Yan, Chuan; Ding, Yanfeng

doi:10.1016/j.eja.2015.11.006

Cited by 71 publications

(45 citation statements)

References 22 publications

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“…The sucrose used for starch synthesis in the grain originates from the degradation of nonstructural carbohydrates (NSCs) assimilated in the leaf sheaths and stems before heading and from the translocation of carbon assimilates from the leaves after heading [34]. Zhang et al [5] reported that NSCs translocated more slowly in response to high levels of panicle N compared with moderate levels. Only 37.9% of 13 C translocated after 20 days after heading under high-panicle N treatment in IIyou 107, while 63.8% translocated under moderate levels.…”

Section: Discussionmentioning

confidence: 99%

Effects of Postponing Topdressing-N on the Yield of Different Types of japonica Rice and Its Relationship with Soil Fertility

Huang

Chu

et al. 2019

Agronomy

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N fertilizer is usually supplied via multiple applications in rice production in China. Due to the high N-recovery efficiency (NRE) of panicle fertilizer, applying large amounts of fertilizer at the booting stage is considered to be an effective measure of increasing yields, although it has adverse effects on eating quality. In this study, using six inbred and four hybrid japonica varieties, we postponed topdressing-N to increase the ratio of panicle N from 20% to 40% by correspondingly reducing the N amount applied only at the tillering stage. We also analyzed the effects of postponing the topdressing-N on grain yield and dry matter accumulation in both high- and low-fertility blue clayey paddy fields in 2016 and 2017. The effects of postponing topdressing-N applications on japonica rice were related to variety, meteorological conditions, and soil fertility. With respect to the inbred varieties, regardless of whether panicle N was applied as a single or split application, increasing the ratio of panicle N had no effect on the yield components or dry matter accumulation of plants grown in either high- and low-fertility soils. Regarding the hybrid varieties grown in the high-fertility soil, although postponing the topdressing-N application had no effect on yield under good weather conditions (no low-temperature stress during grain-filling), a single application of 40% of the total N at the panicle initiation stage significantly decreased both the dry matter accumulation after heading and the seed-setting rate of varieties that presented long growth periods under low-temperature conditions. With respect to hybrid varieties grown in low-fertility soil, postponing the application of topdressing-N had an adverse effect on the number of effective panicles. Our results suggested that the proportion of panicle N applied to japonica rice should not exceed 30% in clayey paddy fields and that fertilizer management with respect to rice production should be adjusted according to soil type, soil fertility, and variety.

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Section: Discussionmentioning

confidence: 99%

Effects of Postponing Topdressing-N on the Yield of Different Types of japonica Rice and Its Relationship with Soil Fertility

Huang

Chu

et al. 2019

Agronomy

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“…Jumlah gabah isi per malai dan gabah total per malai mengalami peningkatan setelah aplikasi pupuk N pada dosis 600 kg urea ha -1 pada kedua genotipe yang diamati. Pupuk N pada dosis 120 kg ha -1 dapat meningkatkan jumlah gabah per malai dan jumlah gabah isi (Mei et al, 2010;Jiang et al, 2016). Aplikasi pupuk N mempengaruhi keragaan karakter jumlah cabang primer, dimana terjadi peningkatan pada aplikasi pupuk urea 600 kg ha -1 yang mencapai jumlah yang sama dengan kategori awal, yaitu lebih dari 13 cabang pada genotipe IPB-175-31-2-1 dan kurang dari 13 cabang primer pada genotipe IPB175-7-1-1, namun pada perlakuan tanpa pupuk N, terjadi penurunan jumlah cabang primer pada kedua genotipe.…”

Section: Pengaruh Pemupukan N Terhadap Karakter Malai Pada Percobaan unclassified

Morfologi Malai Padi (Oryza sativa L.) pada Beragam Aplikasi Pupuk Nitrogen

Rahayu¹,

Ghulamahdi²,

Suwarno³

et al. 2018

J Agron Indonesia

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ABSTRACTThe effects of nitrogen fertilizer on agronomic and morphological characters depend on several factors such as genotypes and nitrogen rate. The study was aimed to evaluate nitrogen effects on rice panicle. A field experiment was conducted at Babakan Research Station during November 2015- February 2016 using a split-split plot design with three replicates. Nitrogen doses was a main plot, genotypes was a subplot, and time of application was a sub-subplot. A greenhouse experiment was carried out at PAIR, Jakarta during February-July 2017 using a completely randomized design with three replicates. The results from the field experiment indicated that the highest panicle number (13.25), number of filled grains (177.94) and spikelet number (213.76) were obtained at doses of 450 kg urea ha-1. Analysis of variance showed that the genotypic effects were significant for all traits observed, while the interaction effect between genotypes and time of nitrogen application was significant on the length of first grain from first node. However, the three-factors interactions were not significant for all traits. The greenhouse experiment revealed that both genotypes and N rates significantly affected all traits except for panicle number and the length of first grain from first node, respectively, while their interaction only significant for number of primary branch. Nitrogen increased all traits observed except the length of first grain from first node. Simultaneously, both experiments showed significant effects of genotypes for all traits observed. Doses of urea fertilizers above 400 kg ha-1 could improve the performance of panicle traits in order to increase yield potential. Keywords: length of first grain from first node, number of primary branches, panicle length, panicle number

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“…A growth response was therefore expected especially due to the reason that soil was low in plant-available Zn and previously applied N might have already used by plant or lost in the environment. Moreover, N application at panicle initiation stage of rice increases grain yield by increasing grain weight in inferior spikelets (19). However, application of N at late vegetative stage delays maturity and increases chances of lodging (20).…”

Section: Discussionmentioning

confidence: 99%

Combined zinc and nitrogen applications at panicle initiation for zinc biofortification in rice

et al. 2019

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Background and purpose: Increasing zinc (Zn) concentration in rice grains can help improve Zn nutrition of people. The combinations of Zn and nitrogen (N) applications at panicle initiation were investigated for Zn biofortification in rice. Materials and methods: Rice (cv. Super Basmati) seedling were grown in pots having a calcareous soil. All combinations of four Zn (control, Soil 6 mg Zn kg-1 , foliar 2 × 0.2% Zn and soil + foliar Zn) and three N (control, soil 20 mg N kg-1 and foliar 0.5% N) levels were imposed at panicle initiation. At maturity, grains analysed for Zn and proteins. Results: Grain protein concentration was significantly increased with foliar Zn treatments, and with soil and foliar N. Maximum grain Zn concertation (30 mg kg-1) was achieved with application of soil Zn + foliar Zn + foliar N. At each N level, Zn application by either method significantly increased grain Zn concentration over control. This increase in grain Zn concertation at N levels was 36 to 54% with soil Zn + foliar Zn, 27 to 45% with foliar Zn and 9 to 15% with soil Zn over its control level. Conclusions: Grain Zn concentration was significantly increased with soil N when combined with soil Zn, and with foliar N when combined with foliar Zn treatments. Conclusively, foliar N combined with soil + foliar Zn is the best combination of late Zn and N application for agronomic Zn biofortification in rice.

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Effect of panicle nitrogen on grain filling characteristics of high-yielding rice cultivars

Cited by 71 publications

References 22 publications

Effects of Postponing Topdressing-N on the Yield of Different Types of japonica Rice and Its Relationship with Soil Fertility

Effects of Postponing Topdressing-N on the Yield of Different Types of japonica Rice and Its Relationship with Soil Fertility

Morfologi Malai Padi (Oryza sativa L.) pada Beragam Aplikasi Pupuk Nitrogen

Combined zinc and nitrogen applications at panicle initiation for zinc biofortification in rice

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