
Effects of Different Nitrogen Fertilizer Levels on Jujube Growth Indexes and Leaf SPAD Values under Drip Irrigation
Rui KOU, Sheng-hai JIA, You-shuai BAI, Xia ZHAO, Yan MA, Rui CAO, Chun-juan XU, Zong-qian ZHENG, Feng GAO, Shu-rui YANG
Effects of Different Nitrogen Fertilizer Levels on Jujube Growth Indexes and Leaf SPAD Values under Drip Irrigation
In order to explore the effects of different nitrogen fertilizer levels on the growth indexes and SPAD value of jujube under drip irrigation, and determine the appropriate local nitrogen application rate, the field experiment was conducted with 7-year-old jujube trees in Minqin, and four nitrogen fertilizer levels (407 kg/hm2, CK; 610 kg/hm2, T1;814 kg/hm2,T2; 1 020 kg/hm2,T3) were set as the treatment. The results showed that the SPAD value of leaves increased with the increase in nitrogen application rate in each growth period.The increase in nitrogen fertilizer can promote the growth of jujube bearing branches to a certain extent. Compared with CK, T3 treatment can increase the length of jujube bearing branches by 16.75 cm, an increase of 11.57%.Increasing nitrogen fertilizer can effectively improve the fruit setting rate of local jujube trees, and T3 has the highest fruit setting rate. Compared with CK and T1, the fruit setting rate increases by 3.69% and 3.06% respectively. T3 treatment has the highest yield, which is 162.99 kg/m2 higher than CK treatment, with an increase of 24.76%. Through the comprehensive evaluation by using the membership function method, it is considered that T3 treatment (1 020 kg/hm2 nitrogen fertilizer application rate) is the optimal treatment and is suitable for the local nitrogen fertilizer application.
jujube / nitrogen fertilizer / SPAD value / bearing branches / fruit setting rate / yield {{custom_keyword}} /
Tab.1 Mature jujube fertilization experiment scheme表1 枣树施肥方案 (kg/hm2) |
处理 | 基肥复合肥(N-P2O5-K2O) | 追肥(尿素,CH4N2O) | |||
---|---|---|---|---|---|
花期 | 幼果期 | 果实膨大期 | 总计 | ||
CK | 75 | 122.1 | 122.1 | 162.8 | 407.0 |
T1 | 75 | 183 | 183 | 244 | 610 |
T2 | 75 | 244.2 | 244.2 | 325.6 | 814.0 |
T3 | 75 | 306 | 306 | 408 | 1 020 |
Tab.2 Effect of nitrogen fertilizer on the chlorophyll content of jujube表2 不同氮肥水平叶绿素含量水平变化 |
开花期 | 幼果期 | 果实膨大期 | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
处理 | SPAD值 | 5%显著水平 | 1%极显著水平 | 处理 | SPAD值 | 5%显著水平 | 1%极显著水平 | 处理 | SPAD值 | 5%显著水平 | 1%极显 著水平 |
CK | 25.77±0.52 | c | B | CK | 26.15±0.17 | b | B | CK | 31.41±0.89 | a | A |
T1 | 26.12±0.44 | bc | B | T1 | 27.21±0.38 | b | B | T1 | 31.85±0.66 | a | A |
T2 | 26.93±0.21 | b | AB | T2 | 29.69±0.51 | a | A | T2 | 32.14±0.91 | a | A |
T3 | 28.25±0.83 | a | A | T3 | 29.84±0.56 | a | A | T3 | 32.46±0.62 | a | A |
Tab.3 Effect of nitrogen fertilizer on the length of new branches表3 不同氮肥水平对枣吊长度的影响 |
06-15 | 06-30 | 07-14 | 07-29 | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
处理 | 枣吊长度 | 5%显著水平 | 处理 | 枣吊长度 | 5%显著水平 | 处理 | 枣吊长度 | 5%显著水平 | 处理 | 枣吊长度 | 5%显著水平 |
CK | 47.32±2.54 | a | CK | 106.47±3.12 | b | CK | 140.25±12.88 | a | CK | 144.83±16.78 | a |
T1 | 44.72±2.53 | a | T1 | 111.72±10.49 | ab | T1 | 145.25±9.38 | a | T1 | 154.17±14.71 | a |
T2 | 48.63±3.45 | a | T2 | 120.43±6.21 | ab | T2 | 152.50±7.55 | a | T2 | 155.33±8.49 | a |
T3 | 48.77±4.24 | a | T3 | 123.55±10.45 | a | T3 | 153.5±11.79 | a | T3 | 161.58±10.19 | a |
Tab.4 Effect of nitrogen fertilizer on fruit setting rate表4 不同氮肥水平对枣树坐果率的影响 |
处理 | 坐果率/% | 5%显著水平 | 1%极显著水平 |
---|---|---|---|
CK | 3.67±0.82 | b | B |
T1 | 4.30±1.52 | b | AB |
T2 | 5.79±1.16 | ab | AB |
T3 | 7.36±0.92 | a | A |
Tab.5 Effect of different nitrogen levels on the yield of jujube表5 不同氮肥水平对红枣产量的影响 |
处理 | 产量/(kg·hm-2) | 5%显著水平 | 1%极显著水平 |
---|---|---|---|
CK | 9 873.01±429.45 | c | B |
T1 | 10 920.62±145.48 | bc | A |
T2 | 11 968.24±469.80 | ab | A |
T3 | 12 317.45±972.80 | a | A |
Tab.6 Results of average membership function values of jujube in different nitrogen fertilizer表6 不同氮肥水平枣树平均隶属函数值结果 |
处理 | 重复 | S 1 | S 2 | S 3 | S 4 | S 5 | S 6 | 隶属函数均值 | 排名 | 综合排名 |
---|---|---|---|---|---|---|---|---|---|---|
CK | 1 | 0.034 1 | 0.014 9 | 0.662 3 | 0.788 2 | 0.321 0 | 0.214 3 | 0.339 1 | 9 | 4 |
2 | 0.256 7 | 0.109 3 | 0.398 5 | 0 | 0.027 5 | 0 | 0.132 0 | 11 | ||
3 | 0 | 0 | 0 | 0.435 3 | 0.057 8 | 0.119 0 | 0.102 0 | 12 | ||
T1 | 1 | 0.316 2 | 0.377 0 | 0.662 3 | 0.794 1 | 0.189 4 | 0.381 0 | 0.453 3 | 7 | 3 |
2 | 0.079 5 | 0.262 8 | 0.662 3 | 0.229 4 | 0 | 0.333 3 | 0.261 2 | 10 | ||
3 | 0.176 5 | 0.118 7 | 0.232 9 | 0.858 8 | 0.587 7 | 0.404 8 | 0.396 6 | 8 | ||
T2 | 1 | 0.469 3 | 0.797 8 | 0.718 4 | 0.870 6 | 0.349 8 | 0.500 0 | 0.617 6 | 5 | 2 |
2 | 0.360 3 | 0.809 7 | 0.910 2 | 0.476 5 | 0.798 7 | 0.714 3 | 0.678 3 | 3 | ||
3 | 0.391 0 | 0.628 9 | 0.250 7 | 0.617 6 | 0.506 1 | 0.690 5 | 0.514 1 | 6 | ||
T3 | 1 | 0.717 2 | 0.648 3 | 0.541 6 | 0.870 6 | 1.000 0 | 1.000 0 | 0.796 3 | 2 | 1 |
2 | 0.564 8 | 0.680 6 | 0.700 7 | 0.535 3 | 0.926 7 | 0.619 0 | 0.671 2 | 4 | ||
3 | 1.000 0 | 1.000 0 | 1.000 0 | 1.000 0 | 0.655 7 | 0.547 6 | 0.867 2 | 1 |
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