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Questions related from Annangi Subba Rao
Best/good agricultural practices can save energy, safeguard environment , save resources and economize on crop production.Fertilizers are costly inputs in agriculture.High rates or excess use of...
22 August 2021 3,407 28 View
The nitrogen requirements of the cereal crops like rice, wheat and maize are high, uptake of around 100 kg N to produce 4-5 tonnes grain or 10 to 11 tonnes of total dry matter. Normally the...
25 June 2021 9,962 35 View
Sustainable agriculture ensures food security, economic returns to farmers, safe to environment and socially acceptable. But how to design sustainable cropping systems for different regions...
29 March 2021 9,106 4 View
The most common zinc fertilizer sources are zinc sulphate (ZnSO4.7H2O) with 21-22% Zn and zinc oxide with 50-80% Zn. ZnO is sparingly soluble while zinc sulphate is highly soluble in soil. How to...
09 September 2019 8,683 1 View
To meet the Zinc requirement of crops in Zn deficient soils fertilizers like urea, diammonium phosphate and single super phosphate are fortified with Zn for soil application . In the fertilizers,...
21 December 2017 6,133 3 View
Rockphosphates and Phosphate fertilizers manufactured from the former are applied to soil to meet the P requirement of crops.Cadmium present in those P sources may accumulate in soil over time...
10 August 2017 4,933 11 View
We have a variety of organic waste materials available including animal dung,crop residues,household organic waste and food waste etc.There are currently two routes available (apart from...
01 July 2017 4,521 3 View
It has been highlighted time and again that the farmers should go for precision agriculture to save on cost of cultivation,increase productivity and increase the input use efficiency.How the...
24 August 2016 7,688 16 View
Heavy metals(Cd,Cr,Hg,Pb,Cu,Zn,As etc) accumulate in soil predominantly because of anthropogenic activities like mining,smelting,fossil fuel burning,contaminated waste disposal,corrosion,urban and...
13 May 2016 9,396 13 View
Several organic on farm resources are available for recycling in cropping systems being practiced on farm like green manure crops on field bunds,weeds and crop residues available on farm for...
19 April 2016 3,854 41 View
Organic materials of plant or animal origin on incorporation in soil, decompose in soil due to microbial action and at least 8-10% remain un-decomposed and transform into humus.Overtime soils may...
21 March 2016 2,025 8 View
Amino acids are building blocks of proteins.Amino acids are made from carbon skeletons and ammonium derived from soil or fertilizer sources of ammonium and nitrate.Can direct application of small...
15 February 2016 3,092 44 View
The neutral normal ammonium acetate method which essentially extracts the water soluble and exchangeable K in soil is the most common method to estimate plant- available soil K in soil testing...
28 January 2016 1,552 35 View
In soils normally the erosion losses of soil phosphate -P are considerable and they are monitored.The leaching losses are presumed to be negligible. Under what soil crop conditions the leaching...
11 January 2016 264 20 View
Sulphur occurs both in inorganic and organic forms in soil .Sulphur is considered as the fourth essential macronutrient required in good amount by crops.Apart from water soluble SO4...
04 January 2016 957 37 View
Manures and crop residues when applied to soil undergo decomposition and mineralization and release nutrients in to soil .Organic manures/ residues on decomposition release organic acids ,enzymes...
10 December 2015 2,598 16 View
Year 2015 is being celebrated as International year of Soil.As we are all aware soil is foundation to agroecosystems and base for agricultural production.Soil is living system ,store house for...
01 December 2015 2,325 50 View
As we are aware,the nutrient needs of crops vary with growth stage. 65-70% of the N and K are taken up by cereal crops during vegetative growth stages.These nutrients,especially N, are also...
03 November 2015 3,674 28 View
Potassium is the third most important plant nutrient required in substantial amounts in crop production.Potassium requirement, quantitatively, is equal to or higher than nitrogen in many...
26 October 2015 6,191 18 View
The legacy or residual phosphorus accumulates in soil from previous years of application of fertilizer and manure.As the use efficiency of current year fertilizer P application is...
21 October 2015 7,563 29 View
With increasing population in several countries in Asia and Africa,they have to double their crop yields in coming decades.However crop yields have been stagnating in different parts of the world...
12 October 2015 4,470 45 View
Soil and plant health is interrelated with animal/human health. Whatever pollutants and contaminants added incidentally to soil may affect the plant -animal/human system.Advanced machinery and...
08 October 2015 445 10 View
By Dictionary meaning manure is animal excreta usually with straw,used to fertilize land..The Thesaurus gives slightly elaborate definition-any animal or plant material used to fertilize land...
22 September 2015 1,412 20 View
Since long we have been using different extractants containing dilute acids/alkalies,weak/strong acids , buffered salt solutions etc.Also specialized methods based on cation and anion...
10 September 2015 529 13 View
Plant roots release as exudates different organic compounds including low molecular organic acids,phytosiderophores,flavonoids compounds/phenolic compounds and enzymes,etc.They induce changes...
30 August 2015 2,117 8 View
Canal(river) and ground(well) waters contain variable amounts of plant nutrients . and the number of irrigations given depend on availability of irrigation water, soil ,crop and local weather...
13 July 2015 6,670 24 View
Several tree fruit crops like citrus,guava,and mango have deep root activity in subsoils while some crops like coffee and cacao have shallower root activity than fruit trees.How far these crops...
07 July 2015 1,784 10 View
Currently several humus acids based formulations including manure /compost extracts and often chelated with micronutreints are being used/recommended for use in crop production.In what way or by...
14 June 2015 6,005 4 View
Normally micronutrients are applied to soil or crop based on soil test. But now several micronutrient mixtures are applied to different crops,irrespective of soil test or deficiency in soil .Some...
18 May 2015 9,460 14 View
Phosphorus is critical input in agriculture and to manufacture P fertilizers several countries have limited rock phosphate reserves. One alternative is to recover P from sewage waters and solid...
30 March 2015 1,226 19 View
Fertilizer P has become a costly in put in recent times and farmers are facing problem in procuring sufficient amount for application to crop as per recommended rates of application. As...
01 January 1970 5,107 19 View
In the recent past research is going on both biochar and hydrochar. Between the two products which is better for use in agriculture, for environmental safety and climate change mitigation based...
01 January 1970 3,091 4 View
In the conventional agriculture high crop yields are obtained and soil fertility and productivity are maintained by following improved practices including good seed, irrigation, fertilizer and...
01 January 1970 9,140 16 View
Legumes grown in cropping systems as pulse crop, forage crop, green manure , cover crops( inter row crop or after the main crop) can add to soil a substantial nitrogen 50- 200kg N/ha and organic...
01 January 1970 8,441 8 View
Nitrogen fertilizer is a critical input in agriculture for increasing and sustaining crop production .But its use efficiency in crops is low (30-50 per cent).Various agronomic and fertilizer...
01 January 1970 5,305 32 View
We have the concepts of humus and the stable carbon in soil.There have been processes, reactions and models based on threse concepts in soil-plant system.But now doubts are raised on both the...
01 January 1970 5,153 12 View
