Soil Science - Study Mode
[#931] Basic Slag & Pelophos are come under
Correct Answer
(A) Citrate soluble
Explanation
Solution: Basic slag and Pelophos come under Citrate soluble . Basic slag is a slag low in silica and high in base-forming oxides that are used in the basic process of steelmaking and that is subsequently useful as a fertilizer. The alkaline Phosphorus fertilizer manufactured from rock phosphate and foundry slag contained 17 - 18% P 2 O 5 and Mg and various micro-nutrients and were more effective on grassland than superphosphate.
[#932] Khaira disease of rice is due to the deficiency of
Correct Answer
(B) Zn
Explanation
Solution: Khaira disease of rice is a micro-nutritional deficiency characterized by the presence of dusty brown patches on leaves which ultimately undergo necrosis. This is one of the common diseases in rice which is caused by the deficiency of Zinc (Zn). Khaira disease affects the leaf of the plant. The rate of photosynthesis decreases which ultimately causes 25 - 30% production loss.
[#933] Symbiotic association of fungal hypae with plant roots is referred to as
Correct Answer
(C) Mycorrhiza
Explanation
Solution: The symbiotic association of fungal hyphae with plant roots is referred to as Mycorrhiza . It is a mutual symbiotic association between a fungus and a plant. It refers to the role of the fungus in the plant’s rhizosphere, its root system. In this association, the fungus colonizes the host plant's root tissues, either intracellular or ectomycorrhizal fungi. Mycorrhizae play important roles in plant nutrition, soil biology and soil chemistry.
[#934] Soil fertility is reduced due to
Correct Answer
(A) Continuous cropping
Explanation
Solution: Soil fertility is reduced due to Continuous cropping. The continuous cropping on the same piece of land causes a decline in the nutrients in the soil. The quantities of nutrients removed from the soil in harvested products exceed the quantities of nutrients being applied.
[#935] Bird guano contains
Correct Answer
(C) 11 - 14% P 2 O 5
Explanation
Solution: Guano is the accumulated excrement of sea birds and bats. It is a highly effective fertilizer due to its exceptionally high content of nitrogen, phosphate and potassium. Bird guano has high levels of nutrients like nitrate and ammonium. It contains about 11 - 14% P 2 O 5 , 8 - 21% nitrogen, 10% protein, 7% ammonia and 0.5% nitrate.