应用诊断施肥综合法(DRIS)对槟榔叶片进行营养诊断

应用诊断施肥综合法(DRIS)对低产园和高产园槟榔进行了叶片营养诊断。结果表明,相对于高产园,低产园元素间关系较不平衡。槟榔叶片N、P、K、Ca、Mg以及Fe、Mn、Cu、Zn的适宜含量分别为(20.53±0.67)、(1.90±0.01)、(13.30±0.46)、(7.14±0.57)、(3.68±0.41)g/kg及(109.50±4.16)、(112.50±9.02)、(6.07±0.64)、(31.23±0.15)mg/kg。低产园N、P、K、Ca、Mg、Fe、Mn、Cu、Zn元素DRIS诊断指数分别为-44.58、-1.60、-17.16、0.09、-31.94、52.78、31.03、23.12、-11.74,需求强度较大的元素为N、Mg、K,其次是Zn、P。

Application of Diagnosis and Recommendation Integrated System in Nutrient Diagnosis of Arecanut

Leaves were collected from low-or high-yielding arecanut(Areca catechu L.) plantations and their nutrients were diagnosed by using the diagnosis and recommendation integrated system(DRIS) to reveal their mineral nutrients relationships. The results showed that compared with the higher yielding orchards, the low-yielding arecanut orchards had an unbalanced relationship in leaf mineral nutrients. The leaf optimum content of N, P, K, Ca, Mg, Fe, Mn, Cu and Zn was (20.53±0.67)g/kg, (1.90±0.01)g/kg, (13.30±0.46) g/kg, (7.14±0.57)g/kg, (3.68±0.41)g/kg, (109.50±4.16)mg/kg, (112.50±9.02)mg/kg, (6.07±0.64)mg/kg, and (31.23±0.15) mg/kg, respectively. The DRIS indexes of N, P, K, Ca, Mg, Fe, Mn, Cu and Zn in low-yielding arecanut were -44.58, -1.60, -17.16, 0.09, -31.94, 52.78, 31.03, 23.12, and -11.74, respectively, and the nutrients badly needed in the low-yielding orchards were N, Mg, and K, followed by Zn and P.