339. Which vegetation experiment is used to more accurately study the development of the root system of plants? a) sand and water culture methods b) from an isolated feeding method c) from the sterile culture method d) from the soil culture method e) from the method of flowing solutions 340. How is the only difference principle, which is one of the main methodical requirements of the field experiment, explained? a) Field observations are compared across options b) In practice, product information is compared by options c) The effect of one factor should be studied in the experiment d) In practice, the influencing factors should be the same in all variants e) Field observations, crop data are comparable across options. 341. What is typical of field experience? a) the conditions of the place where the experiment is conducted should be similar to the conditions of the region b) there should be crop rotation in the experimental farm c) there should be organic and mineral fertilizers in the experimental farm d) a predecessor plant should be planted in the experimental farm e) agrotechnical measures should be performed normally in the experimental farm 342. What is hydroponics? a) cultivation of plants without soil in special containers using sand, gravel, vermiculite, cocobit, etc. as a substrate b) cultivation of plants in sand culture c) cultivation of plants in water culture d) is the cultivation of plants in the soil, but here fertilizers are mixed with irrigation water. e) cultivation of plants in artificial nutrient solution 343. How many options does the simplest scheme of the field experiment have? a) 2 b) 3 c) 5 d) 4 e) 6 344. What is the main issue studied in the lysimeter experiment? a) leaching of nutrients from the soil b) movement of water in the soil and leaching of nutrients c) soil aeration d) thermal regime of the soil e) soil porosity 345. What are the methodological conditions for improving the quality of field experience? a) Homogeneity of soil cover, typicality of practice, mechanization of fertilizer application b) Typicality of practice, the principle of a single difference, options c) The principle of a single difference, the homogeneity of the soil cover, the relevance of the experience d) The typicality of the experience, the fertility of the soil, the principle of a single difference e) Typicality of experience, homogeneity of land cover, single difference principle 346. What is an error made during an experiment called when it differs from the true result for an unknown reason? a) relative error b) systematic error c) definitely error d) random error e) least significant difference 347. What is the name of an error made during practice when it consists of a specific reason? a) systematic error b) random error c) definitely error d) relative error e) least significant difference 348. There is no such type of field experience: a) one-factor experiments b) multiple experiences c) stationary experiments d) mass experiments e) autumn experiences 349. What limit of concentration of nutrients has the most positive effect on plant productivity? a) Optimum b) Severe deficit c) Small deficit d) Excessive e) Toxic
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