Nitrogen fertilizer is the straight fertilizer providing the element of N and the most needed fertilizer in agricultural production.
银河彩票As the essential constituent of proteins, N is involved in all the major processes of plant development, and plays important
roles in the increase of crop yield and improvement of crop quality.
Phosphate fertilizer is the straight fertilizer providing the element of P. P is essential for photosynthesis and other chemico-
physiological. P is also indispensable for cell differentiation, as well as for the development of the tissues that form a plant's
银河彩票Potash fertilizer is the straight fertilizer providing the element of K. K plays a vital part in carbohydrate and protein synthesis.
It improves a plant's water regime and increases tolerance to drought and frost. Plants that are well supplied with K are less
银河彩票affected by disease.
银河彩票Fertilizer containing only one fertilizer nutrient (N, P or K).
Any fertilizer containing two of the nutrients N, P and K.
银河彩票Material containing two or three of the primary nutrients N, P and K.
NPK compound (ternary compound)
Compound containing all three of the primary nutrients N, P and K.
The ratio of the contents of fertilizer nutrients in a fertilizer, e.g. a fertilizer with analysis 12-12-18 has a 1-1-1.5 ratio. Expressed
银河彩票in terms of N, P or P2O5 and K or K2O depending on local legislation.
银河彩票A product based on microbial inoculants or organic growth stimulants.
银河彩票Fertilizer in which one or more trace elements are held by complex organic molecules (chelating agents) and are gradually
银河彩票released, thus prolonging the period of plant availability.
银河彩票A fertilizer in which the particles are covered by a layer of a different substance; thin layers are used to prevent moisture
pick-up or caking and thicker layers or less permeable materials to delay or prolong the release of nutrients.
Slow release fertilizer
A fertilizer which releases nutrients over a period of time; slow release: gradual release over much or all of the growth
period ; controlled release: a delayed release of plant nutrients some time after application. (For example, sulphur coated
银河彩票urea, IBDU etc.).
银河彩票In most countries, N, P and K, but sometimes including other nutrients supplied in fertilizers, e.g. Mg, S.
银河彩票Major nutrients (primary nutrients)
银河彩票N, P and K; the three nutrients required by plants in large or moderate amounts and which it is the main purpose of fertilizers
Micronutrients(trace elements, oligo-elements)
银河彩票B, Cl, Cu, Fe, Mn, Mo, Zn - nutrients required by plants in very small quantities.
Ca, Mg, S : nutrients other than N, P, K required in moderate or large amounts by plants.
Basal dressing (base dressing)
Fertilizer (usually P and K) applied before establishment of a crop or orchard to provide for its needs over a season or period of years.
银河彩票Application not followed by incorporation, usually to grassland or an established crop.
General term for putting fertilizer on fields, crops, grassland, forests etc.
Weight of fertilizer (for liquids often volume) applied per unit area.
The application of nutrients in proportions best suited to the needs of the crop taking account of the amounts of each
银河彩票supplied by the soil.
The modification of soil and crop management according to the different conditions found within the field.