science

Neem cake

Neem cake is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Neem cake rather than just read about it. In short: Neem cake organic manure is the by-product obtained in the process of cold pressing of neem tree fruits and kernels, and the solvent extraction process for neem oil cake. It is a potential source of organic manure under the Bureau of Indian Standards, Specification No. 8558.

Key takeaways

Neem cake belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Neem cake to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Neem cake from memory before moving on to harder problems.

Reference excerpt

Neem cake organic manure is the by-product obtained in the process of cold pressing of neem tree fruits and kernels, and the solvent extraction process for neem oil cake. It is a potential source of organic manure under the Bureau of Indian Standards, Specification No. 8558. Neem has demonstrated considerable potential as a fertilizer. For this purpose, neem cake and neem leaves are especially promising. Puri (1999), in his book Neem : The Divine Tree Azadirachta, has given details about neem seed cake as manure and nitrification inhibitor. The author has described that, after processing, neem cake can be used for partial replacement of poultry and cattle feed.

Components

Neem cake has an adequate quantity of NPK in organic form for plant growth. Being a totally botanical product it contains 100% natural NPK content and other essential micro nutrients as N (Nitrogen 2.0% to 5.0%), P (Phosphorus 0.5% to 1.0%), K (Potassium 1.0% to 2.0%), Ca (Calcium 0.5% to 3.0%), Mg (Magnesium 0.3% to 1.0%), S (Sulphur 0.2% to 3.0%), Zn (Zinc 15 ppm to 60 ppm), Cu (Copper 4 ppm to 20 ppm), Fe (Iron 500 ppm to 1200 ppm), Mn (Manganese 20 ppm to 60 ppm). It is rich in both sulphur compounds and bitter limonoids. According to research calculations, neem cake seems to make soil more fertile due to an ingredient that blocks soil bacteria from converting nitrogenous compounds into nitrogen gas. It is a nitrification inhibitor and prolongs the availability of nitrogen to both short duration and long duration crops.

Use as a fertilizer Neem cake organic manure protects plant roots from nematodes, soil grubs and termites, probably due to its residual limonoid content. It also acts as a natural fertilizer with pesticidal properties. Neem cake is widely used in India to fertilize paddy, cotton and sugarcane. Usage of neem cake have shown an increase in the dry matter in Tectona grandis (teak), Acacia nilotica (gum arabic), and other forest trees. Neem seed cake can also reduce alkalinity in soil, as it produces organic acids upon decomposition. Being totally natural, it is compatible with soil microbes and rhizosphere microflora and hence ensures fertility of the soil. Neem cake improves the organic matter content of the soil, helps improve soil texture, water holding capacity, and soil aeration for better root development.

Pest control Neem cake is effective in the management of insects and pests. The bitter principles of the soil and cake have been reported to have seven types of activity: (a) antifeedant, (b) attractant, (c) repellent, (d) insecticide, (e) nematicide, (f) growth disruptor and (g) antimicrobial. The cake contains salannin, nimbin, azadirachtin, meliantriol and azadiradione as the major components. Of these, azadirachtin and meliantriol are used as locust antifeedants while salannin is used as an antifeedant for the housefly.

See also Arid Forest Research Institute (AFRI) Neem Neem oil Azadirachtin Organic farming

References

General references Schmutterer, H. (Editor) (2002) The Neem Tree: Source of Unique Natural Products for Integrated Pest Management, Medicine, Industry And Other Purposes (Hardcover), 2nd Edition, Weinheim, Germany: VCH Verlagsgesellschaft. ISBN 3-527-30054-6 Tewari, D. N. (1992), Monograph on neem (Azadirachta indica A. Juss.). Dehra Dun, India: International Book Distributors. pp.123-128 ISBN 81-7089-175-2 Vietmeyer, N. D. (Director) (1992), Neem: A Tree for Solving Global Problems. Report of an ad hoc panel of the Board on Science and Technology for International Development, National Research Council, Washington, DC, USA: National Academy Press. pp.74-75. ISBN 0-309-04686-6 Puri, H.S. (1999) Neem: The Divine Tree. Azadirachta indica. Harwood Academic Publishers, Amsterdam. ISBN 90-5702-348-2

Worked examples

Example 1 — a first encounter with Neem cake

Start with the simplest possible case. Write down what Neem cake claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Neem cake before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Neem cake ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Neem cake

In research: Neem cake appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Neem cake in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Neem cake is common in secondary-school and first-year university syllabi. It links to neighbouring topics Plant toxin insecticides, so understanding it makes those chapters shorter.
In everyday life: Look for Neem cake outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Neem cake in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Neem cake means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Neem cake out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Neem cake in simple terms?

Why does Neem cake matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Neem cake?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Neem cake.