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31. The humic acid is traditionally obtained by adding acid to the extracting liquid through base.

32. The humic acid ( HA ) environment - benign agrochemicals should be understood with scientific development view.

33. An indirect method was used for determine the complex calcium in nitro humic acid complex calcium.

34. The half - life of humic acid is measured in centuries.

35. By using round-plate method, the regulation of stomatal opening by abscisic acid (ABA), kinetin (KT) and humic acid (HA) was compared.

36. Result shows that when humic acid sodium is used as glue of lignite semi-coke[sentencedict.com/humic acid.html], it has good composite index.

37. Humic acid is one of important semi - finished products that produced during oxidation degradation of the coals.

38. Today, treatment techniques for waste slurry of molasses alcohol included irrigation and drainage, concentration and burn up, bio-oxidation, active humic acid etc.

39. The measurement of humic acid, trihalom- ethanes and nonvolatile organic compounds in raw water, chlorinating water and tip water of several waterworks were carry out in two dis- tinct seasons.

40. Reverse osmosis and nanofiltration membranes fouled by humic acid were systematically characterized by transmission electron microscopy.

41. Adsorption of chlorpyrifos on humic acid (HA) of neutral purple soil was studied through balance vibration method.

42. Low humic acid concentration accelerated 2,4 - DCP photodegradation rate while high humic acid concentration restrained photodegradation.

43. We studied the fabricating method of humic acid sodium and forming process of lignite semi-coke and tested strength indexes of moulded coke of different proportioning.

44. The results showed that alkali lignin of rice straw is a good fertilizer raw material. It has high dissociable humic acid content and good fertilizer efficiency.

45. Humic acid was extracted from swampy soil in Zhongdian at Yunnan and characterized.

46. Experiments show that causticizing by adding a small quantity of slaked lime can eliminate the interference of carbonate ions and humic acid salts.

47. The humic acid was dosed as the precursor of trihalomethanes(THM) and second order kinetics was identified for the THM formation reaction.

48. The organic agents prescription of lignin, lignin sulfonate(sentencedict.com), humic acid in negative paste and the effects of them on negative plate performance were studied.

49. Infrared spectra (FTIR) showed that mechanochemistry reaction occurred and the resultants mainly were humic acid salt during milling.

50. The humic acid bonded silica gel has characteristics of larger penetrating capacity, high adsorbance per unit quality and high selectivity when it is used for solid phase abstraction.

51. The herbaceous peat of mesic and medium—ashes is mainly used for the nutrition soil, nutrition—bowl, fuel, extracting humic acid, and made into humic fertilizer.

52. The poplar growth and soil enzymatic activity was studied as affected by humic acid fertilizer(NHA), which was made by activated brown coal.

53. The result indicated that applying humic acid properly decreased nitrate con-centration but increased nitrate reductase activity(NRA) and enlarged nitrate metabolic pool size in leaf vegetables.

54. We use the best lignite or peat, activity humic acid sodium manufacturing.

55. In the meantime, chemical promoter 4PU-30, Yield precise, humic acid and IAA can promote single spike weight and growth of regeneration bud, which resulted in high spike numbers and high yield.

56. Effects of application of sesame cake, humic acid and ploughing back of alfalfa and rye grass on the growth and quality of tobacco were studied in the field experiment.