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通过田间试验研究滴灌条件下施肥对陕北丘陵区山地梨枣生长和产量的影响。结果表明,施用氮磷钾肥后,新梢长度、叶面积和叶绿素含量均与不施肥对照(CK)有显著差异(P<0.05)。施用N 363kg·hm~(-2)+P_2O_5450kg·hm~(-2)+K_2O 267kg·hm~(-2)(N_1P_3K_3)的枣树新梢生长量、单叶干重均达到最大,分别为11.93cm和1.67g,较CK分别提高了77.3%和46.5%,差异显著(P<0.05);氮与磷配施能显著提高梨枣叶面积,N 535kg·hm~(-2)+P_2O_5267kg·hm~(-2)(N_2P_2)处理的叶面积达851.67mm~2,是CK的1.51倍;N_1P_3K_3处理促进了梨枣的生殖生长,其坐果率和产量均表现为最优,达到了5.72%和15.73kg·株~(-1),分别较CK提高了3.05%和48.3%,差异显著(P<0.05)。对梨枣产量肥效方程进行主效应分析得出:氮、磷、钾对梨枣产量的影响为钾肥(正效应)>磷肥(正效应)>氮肥(负效应)。说明在陕北黄土丘陵区施用氮磷钾肥可有效促进矮化密植梨枣的生长发育,并提高产量,其中以N_1P_3K_3效果最佳。
Effects of Fertigation under Drip Irrigation Conditions on Growth and Yield of Rizora. JOURNAL OF AGRICULTURAL SCIENCES. The results showed that there was a significant difference in shoot length, leaf area and chlorophyll content between CK and CK after application of NPK fertilizers (P <0.05). The shoot growth and the dry weight per leaf of the jujube reached the maximum under N 363 kg · hm -2 and P 2 O 5454 kg · hm -2 · K 2 O 267 kg · hm -2 (N 1 P 3K 3) 11.93cm and 1.67g, respectively, increased by 77.3% and 46.5% respectively compared with CK (P <0.05). The combination of nitrogen and phosphorus could significantly increase the leaf area, N 535kg · hm -2 and P 2 O 5267 kg · The leaf area of hm ~ (-2) (N_2P_2) reached 851.67mm ~ 2, which was 1.51 times of that of CK. N_1P_3K_3 treatment promoted the reproductive growth of pear. The fruit setting rate and yield all showed the best, reaching 5.72% And 15.73kg · plant ~ (-1), respectively, increased by 3.05% and 48.3% respectively compared with CK (P <0.05). The main effects of yield equation of pear were analyzed. The results showed that the effects of nitrogen, phosphorus and potassium on the yield of pear were positive (potassium) (positive)> phosphorus (positive)> nitrogen (negative). The results showed that applying N, P and K fertilizers in the loess hilly region of North Shaanxi Province could effectively promote the growth and development of dwarf and densely populated pear cultivars and improve the yield, of which N_1P_3K_3 was the best.