Influence of neem leaf on nitrification in a lowland rice soil

Santhi, S.; Palaniappan, S.; Purushothaman, D.

doi:10.1007/bf02377153

Cited by 18 publications

(6 citation statements)

References 3 publications

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“…Studies conducted by Patel and Desai (1985) also gave similar observations with organophosphorus pesticides. Neem oil cake showed significant suppression of both the chemoautotrophs which is in agreement with the observations of Mishra et al, (1975), Santhi et al, (1986) and Gopal (1995). It is also a well known fact that neem extracts are being used with urea prills as nitrification retarders (Waghray, 1997).…”

Section: Discussionsupporting

confidence: 91%

Effect of Systemic Soil Insecticides and a Plant Product on Microbial Load of Soil in Root (wilt) Affected Coconut Monocropping Ecosystem

Gopal¹,

Gupta²,

Rajan³

et al. 2001

CORD

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The changes undergoing in the microorganism population due to the application of phorate 10G, carbofuran 3G (@ 10 g a.i./ palm) and neem oil cake (@ 1.5 kg / palm) in the basin region of coconut growing in root (wilt) affected area was studied. Generally, a high microbial population was observed in the control plot. Carbofuran proved to be more toxic as compared to phorate as it suppressed the bacterial, actinomycetal, and free-living N2 -fixer’s number significantly. Against Nitrosomonas and Nitrobacter (nitrifiers), the influence was inconsistent. Neem oil cake enhanced bacterial and free-living N2-fixer count; against actinomycetes and fungi there was an initial stimulatory, and then antagonistic impact, whereas, it proved detrimental to the nitrifiers. From the six soil samplings done, spread over a period of six months, the microbial load was recorded to be high whenever there was moderate rainfall and medium temperature. Application of neem oil cake produced positive effect on the beneficial microorganisms as compared to the systemic insecticides.

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Section: Discussionsupporting

confidence: 91%

Effect of Systemic Soil Insecticides and a Plant Product on Microbial Load of Soil in Root (wilt) Affected Coconut Monocropping Ecosystem

Gopal¹,

Gupta²,

Rajan³

et al. 2001

CORD

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“…This implies the presence of an easily mineralizable N pool in the manure usually related to less stable organic matter (Laos, Satti, Walter, & Mazzarino, 2000;Preusch, Adler, Sikora, & Tworkoski, 2002). T1 T2 T5 T8 T10 T13 Neem acting as a nitrification inhibitor when mixed with inorganic fertilizers was widely reported (Santhi et al, 1986;Suganya et al, 2007;Gnanavelrajah, 2011). In the present study it was observed that the NO 3 2-N content remains significantly lower than the control in VC + Neem treatment during the initial 10 days indicating that nitrification has been inhibited.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen Release Pattern From Organic Manures Applied to an Acid Soil

Murugan

Swarnam²

2013

JAS

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Study of nitrogen release pattern from organic manures is very essential to ensure nitrogen supply in adequate quantity and at proper time to crop plants in an acid soil. A laboratory incubation experiment was conducted to determine the nitrogen release pattern from vermicompost (V.C), poultry manure (P.M), neem, inorganic fertilizer (I.O) and its combinations applied to an acid soil at two different rates. Cumulative nitrogen mineralization was significantly higher throughout the incubation period for I.O, V.C+P.M and I.O+V.C while it was two weeks after incubation for V.C and V.C+Neem due to the inhibitory effect of neem on nitrification. The results indicated a significant increase in the rate of N mineralization in the first one week in which the highest rate of 3.36 mg N day -1 was observed for inorganic fertilizer and thereafter it slowed down. V.C followed by V.C+Neem recorded higher rate of N mineralization of 0.24 and 0.23 mg day -1 respectively, from 48 th days after incubation. V.C+Neem at 120 kg N equivalent ha -1 recorded the highest ammonia content of 42.1% to total available N while V.C+P.M recorded higher nitrate content of 82.3% at the end of the incubation period. Positive correlation between initial nitrogen and total mineralized N from the manures and fertilizers (R 2 = 0.563) was observed. Furthermore, addition of organic manures resulted in increase in soil pH where as inorganic fertilizer showed a slight decrease (5.73) than control (5.78).

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“…Após secas ao ar, destorroadas e passadas em peneira de malha de 2,0 mm, as amostras foram encaminhadas ao Laboratório de Solos e Nutrição Mineral do CCTA/UFCG para sua caracterização química e física (Tabela 1) conforme procedimentos descritos em EMBRAPA (2011). O preparo dos extratos e sua aplicação no solo foi baseada em (Santhi et al, 1986 No preparo das soluções de ureia foram tomados 100 mL de cada extrato (correspondente a 1,0 g de matéria seca de folhas ou de sementes) nos quais foram adicionados ureia nas proporções de 10,0 g; 5,0 g; 3,3 g e 2,5 g 100 mL -1 , obtendo-se as proporções de 10, 20, 30 e 40%, respectivamente. Na proporção 0%, foi tomado 50 mL de álcool mais 50 mL de água destilada e adicionado 10 g de ureia.…”

Section: Methodsunclassified