A. Hymatomelanic acid & Humin
B. Humic acid & Fulvic acid
C. both A & B
D. None of these
Submitted by: Shafiq Rehman
Correct Answer: both A & B ✔
Last Updated: November 05, 2020
Related MCQs
- Which of the following is a component of nucleic acid and protein:
- Rhizoplane is________?
- Which chemical used to prevent evaporation from surface of water in water bodies?
- Composition of igneous rock is determined by__________?
- Who will decompose organic matter first:
- Process of mixing of soils is known as_________?
- Walkley and Blacks method of organic matter determination allows recovery of _____% organic carbon content:
- The soil samples are dried at __________, for gravimetric soil analysis?
- The appropriate method to apply phosphatic fertilizers is__________?
- Integrated Nutrient Management (INM) is a well-accepted approach for the sustainable management of________?
- Organic (O) horizon is absent in_________?
- Association of two microorganisms in which one is benefited while other remains unaffected is known as:________?
- What is Vesicular Arbuscular Mycorrhiza (VAM)?
- The very high temperatures required for ICP-AES are attained by__________?
- Exposure of the manures to rains causes highest loss of__________?
- In cotton, zn deficiency is known as_________?
- 1 mg of H+ will be equal to_________?
- The unique soil environment under the influence of plants roots is called rhizosphere and this term was given by__________?
- The credit for identifying the essentality of K, Ca, Mg and P to planta goes to________?
- Rate of entry of water in soil is__________?
- Which leaf of rice is sampled for tissue nutrient analysis?
- During decomposition of organic matter, inititial decomposition is dominated by:__________?
- The instrument used for measuring the photosynthetically active radiations (PAR) is:________?
- The credit for identifying the essentality of nitrogen to plants goes to________?
- What kind of nitrogenous (N) fertilizers should not be used for flooded soil:
- 1 meq of HCl is equal to_________?
- Organisms satisfying their carbon requirement as Co2 from atmosphere and energy requirement from oxidation of simple inorganic compound are called as_________?
- Loss of nitrogen in the form of NH3 in alkaline medium is known as_________?
- Browning disease of rice is a_________?
- If a manure pile is exposed to the rain, what nutrient will be lost the most ?
- What is the optimum temperature and pH for nitrifying bacteria ?
- The first mechanism to start in the wind erosion is_________?
- The indicator used for estimation of the soil available boron is_______?
- Source of negative charges on silicate clays is/ are________?
- Soil order characterized by excess of weathering with dominant iron and aluminium oxide clays, common in tropics is_________?
- 1 bar is equal to_________?
- Select the water soluble phosphatic fertilizer from the following__________?
- Journal ‘Plant and Soil’ is published from__________?
- Most out standing green manure crop is__________?
- Walkley and blacks method of organic matter determination allows recovery of ______ ℅ organic carbon content:
- One ha cm of water is equal to__________?
- In cation exchange, 18 mg of Ammonium ion can be exchanged for__________?
- The maximum amount of water which a soil can hold after free drainage has ceased is called as_______?
- In Pakistan, The following igneous rocks are found over considerable areas:
- __________ consist of particles that are produced by disintegration of pre-existing rocks through the process of weathering:
- Basalt is a __________ rock:
- ‘A’ horizon of the soil is also designated:
- Weathering process-physical, chemical, and biological __________, the rocks and minerals into simpler products which either accumulate in place or are transported to other places where they become soil parent materials?
- Rocks and weathered materials transported by __________ ,act as initial materials for soil formation?
- From the point of view of crop production, Soil testing refers to__________?
- The diagnostic techniques used in evaluating soil nutrient status and determining fertilizer requirements of the crop include: