Response of nitrogen fertilization on Bt and non-Bt cotton (Gossypium hirsutum) hybrids

Gangaiah, B.; Ahlawat, I. P. S.; Babu, M.B.B. Prasad

doi:10.3329/sja.v11i1.18389

Cited by 13 publications

(13 citation statements)

References 5 publications

(3 reference statements)

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“…The probable reason for this might be the variation in the genetic constitution of the cultivars which has responded better in plant height. These results were in closer conformity with the findings of Manjunatha et al, (2010) and Gangaiah et al, (2013).…”

Section: Effect Of Bt Genesupporting

confidence: 83%

Productivity of BT and Non BT Cotton (Gossypium hirsutum L.) Cultivars as Influenced by Plant Geometry and Fertilizer Levels

Nagender¹,

Reddy²,

Rani³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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Section: Effect Of Bt Genesupporting

confidence: 83%

Productivity of BT and Non BT Cotton (Gossypium hirsutum L.) Cultivars as Influenced by Plant Geometry and Fertilizer Levels

Nagender¹,

Reddy²,

Rani³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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“…In a 2-year experiment conducted at New Delhi in a soil similar to that in the current study, Gangaiah et al (2013) reported that pooled seed cotton yield of Bt cotton hybrids increased by applying N up to 120 kg N ha -1 . Nitrogen application beyond the optimum level in cotton may reduce the yield (Wood et al, 1992) due to rank growth and decreases in the harvest index (Bouquet et al, 1994).…”

Section: Discussionsupporting

confidence: 65%

Site-specific fertilizer nitrogen management in Bt cotton using chlorophyll meter

2020

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Field experiments were conducted to standardize protocols for site-specific fertilizer nitrogen (N) management in Bt cotton using Soil Plant Analysis Development (SPAD) chlorophyll meter. Performance of different SPAD-based site-specific N management scenarios was evaluated vis-à-vis blanket fertilizer N recommendation. The N treatments comprised a no-N (control), four fixed-time and fixed N doses (60, 90, 120, and 150 kg N ha-1) including the recommended dose (150 kg ha-1), and eight fixed-time and adjustable N doses based on critical SPAD readings of 45 and 41 at first flowering and boll formation stages, respectively. The results revealed that by applying 45 or 60 kg N ha-1 at thinning stage of the crop and critical SPAD value-guided dose of 45 or 30 kg N ha-1 at first flowering stage resulted in yields similar to that recorded by applying the recommended dose of 150 kg N ha-1. However, significantly higher N use efficiency as well as 30–40% less total fertilizer N use was recorded with site-specific N management. Applying 30 kg N ha-1 at thinning and SPAD meter-guided 45 kg N ha-1 at first flowering were not enough and required additional SPAD meter-guided 45 kg N ha-1 at boll formation for sustaining yield levels equivalent to those observed by following blanket recommendation but resulted in 20% less fertilizer N application. Our data revealed that SPAD meter-based site-specific N management in Bt cotton results in optimum yield with dynamic adjustment of fertilizer N doses at first flowering and boll formation stages. The total amount of N fertilizer following site-specific management strategies was substantially less than the blanket recommendation of 150 kg N ha-1, but the extent may vary in different fields.

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“…However, none of the previous studies could determine the proportionate contribution of fertilizers in increasing the cotton yield in India during the BT phase. Besides, BT cotton hybrids showed better nitrogen use efficiency and also responded well to the increased N application as compared to non-BT hybrids (Gangaiah et al, 2013). Therefore, increase in the yield of cotton in India during the BT phase could be due to the cultivation of nitrogen responsive Bt hybrids.…”

Section: Discussionmentioning

confidence: 93%

“…However, response of cotton yield to Napplicationwas found to have quadratic relationship and showed maximum peak @ 180kg/ha (Gangaiah et al, 2013). Besides, higher dose of fertilizers has been reported to increase the population of sucking pests in cotton (Kalaichelvi, 2008).Thus, the observed reduction in PFP of cotton from 2009 to 2014 in India might be due to the higher dose of fertilizer application, i.e.…”

Section: Discussionmentioning

confidence: 98%

Fertilizers, BT technology, and insecticides contributed to 60%, 23%, and 17%, respectively to the increase in BT cotton yield: An analysis from 2000 to 2014 in India

Parameswaran

Sai

2020

Preprint

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27Complementary technologies and agricultural practices capable of sustaining profitability to the 28 farmers cultivating BtCotton in India require urgent attention. In India, approval of Btcotton, 29 cultivation of fertilizer-intensive hybrids, higher dose of fertilizer application by farmers, usage 30 of novel pesticides all happened simultaneously during the same period (2002-04) which makes 31 very difficult to identify the individual effect in the yield gain of cotton. In this background, we 32 attempted to understand the proportionate contribution of fertilizers, BT technology and novel 33 group of pesticides in enhancing cotton yield in India. For the analysis, linear regression model 34 and change in partial factor productivity (PFP) of cotton was considered in four different 35 scenarios for yield estimation between 2000 and 2014, i.e. Scenario I: Cotton yield in the 36 absence of technology and enhanced fertilizers usage, Scenario II: Cotton yield only due to 37 enhanced fertilizer usage, Scenario III: Cotton yield with enhanced fertilizer and application of 38 novel pesticides for the insect control, and Scenario IV: Cotton yield due to BT technology, 39 enhanced use of fertilizer, and novel insecticides (actual yield of Cotton in India during Bt 40 phase).Their comparison showed that the individual effect of fertilizers, BT technology and 41 insecticides contributed to 60%, 23% and 17% of cotton yield, respectively in India. Further, 42 18% reduction in PFP was observed recently as compared to 2003-08. Besides, 125 Kg/ha of 43 fertilizers was identified as optimum dose for sustaining high yield in cotton. Thus, present 44 analysis identified the individual effect of different technologies contributing to the yield of 45 cotton in India which can be used in decision making processes for crop improvement. Further, 46 in our opinion, three strategies namely drip fertigation, intercrossing Bt and non-Bt hybrids for 47 resistance management in bollworms, and IPM for sucking pests will primarily drive the research 48 priorities and policy actions for the next 5 to 10 years in sustaining the economic benefits of the 49 six million cotton farmers in India. 50 Keywords 51 Bt cotton, yield trend, fertilizers, pesticides, sucking pests, partial factor productivity 52 53 55 Cotton yield gain story in India is one of the inspiring technological achievements. In 56 India, ~ six million farmers cultivates cotton in an area of about 12 million hectares (2017-18) 57 and approximately 50 million people are either directly or indirectly dependent on cotton for 58 their employment and livelihood. Further, India is the leading producer of cotton in the world.59

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Response of nitrogen fertilization on Bt and non-Bt cotton (Gossypium hirsutum) hybrids

Cited by 13 publications

References 5 publications

Productivity of BT and Non BT Cotton (Gossypium hirsutum L.) Cultivars as Influenced by Plant Geometry and Fertilizer Levels

Productivity of BT and Non BT Cotton (Gossypium hirsutum L.) Cultivars as Influenced by Plant Geometry and Fertilizer Levels

Site-specific fertilizer nitrogen management in Bt cotton using chlorophyll meter

Fertilizers, BT technology, and insecticides contributed to 60%, 23%, and 17%, respectively to the increase in BT cotton yield: An analysis from 2000 to 2014 in India

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