几种甘蔗品种残体量及其养分含量

Several sugarcane cultivars residues quantity and nutrient content of the residue

广西主栽甘蔗品种通过桶栽法研究甘蔗叶、根茬、蔗头、尾梢等残体的量，探讨这些残体与甘蔗茎产量的比例关系以及这些残体所含有的NPK养分。结果表明，甘蔗品种之间其全部残体的量是因品种而异，甘蔗全部残体干重与蔗茎产量鲜重之比为0．167～0．294；甘蔗叶在全部残体中占71．36％，是甘蔗鲜重产量的11．9％～20．7％，叶干重所占单株全部残体的比例最大，根次之，达18．29％，第三为蔗头，占6．37％，而尾梢最低，仅为4．02％；甘蔗收获时干叶、青叶、尾梢、蔗根、蔗头的含N平均值分别为5．92、6．16、7．29、3．87、3．16g/k，而磷（P）含量平均值分别为0．65、1．01、2．27、0．59、0．66g／kg，钾（K）含量平均值分别为6．24、9．11、21．97、5．71、4．92g/kg；充分利用好这些残体，有助于提高蔗地土壤有机质含量和养分循环利用。

Three main sugarcane cultivars in Gaugnxi were used to test the crop difference part residue and the NPK of the residue by the method of barrel cultivation. The ratio of total dry weight residue of sugarcane and its fresh millable cane stalk weight was 0. 167 -0. 294, ranging with different cultivar. Of the total dry residue, the leaf, the root, the under - ground stalk, the tip part accounted for 71.36%, 18. 29%, 6. 37%, 4. 02%, respectively. The N content of dry leaf, fresh leaf, tip part, root and under - earth cane stalk at harvest time was 5.92 g/kg, 6. 16 g/kg, 7.29 g/kg, 3.87 g/kg, 3.16 g/kg, respectively; the corresponding P content was 0.65 g/kg, 1.01 g/kg, 2. 27 g/kg, 0. 59 g/kg, 0. 66 g/kg; and the corresponding K content was 6. 24 g/kg, 9. 11 g/kg, 21.97 g/kg, 5.71 g/kg, 4. 92 g/kg. Recycling use of these residues is helpful for improving soil organic content and recycling use of nutrients.